How much does a liter of water weigh? How many liters in one kilogram of paint

The weight of one liter of water weighed at an atmospheric pressure of 760 mm and a temperature of the highest density of water of 4 ° C is approximately 998.5 grams.

The weight of one liter of water is approximately 998.5 grams.

Water is the most unusual liquid on our planet. Indeed, thanks to water, not only life on Earth appeared, but also many important inventions that played a huge role in the development of the technical progress of mankind. It's all about the amazing properties of water, which can easily go from a liquid state to a solid or gaseous state. In everyday life, it often becomes necessary to determine the mass of this liquid - whether it is a chemical experiment in a school chemistry lesson, a production process, or just household needs. How much does 1 liter of water weigh? The answer to this question is not as simple as it might seem at first glance.

What determines the mass of water?

According to the laws of physics, there is a difference between weight and mass. If we talk about weight, then we mean the force of the impact of a body of a certain mass on the surface. And the term "mass" denotes a quantitative measure of the inertia of the body, which is measured in kilograms. In our article we are talking about the mass of water.

How much does a liter of water weigh? This indicator depends on:

• temperature
• atmospheric pressure
• water conditions (liquid, ice, snow)
• salinity of water (fresh, salty)
• types of hydrogen isotopes

So the weight of water depends on all the above factors, which together determine the value of this indicator.

How much does a liter of water weigh - a bit of history

At different times, the answer to this question was not the same. But the annual consumption of water in the world is extremely large! Therefore, it was necessary to make a general decision regarding the measurement of the mass of the liquid. So, in 1964, during the international conference on weights and measures, a unit was approved, denoting the volume of 1 dm 3 of water - a liter.

However, this unit means, rather, not weight, but volume. In this case, the weight can be completely different - for example, a liter of water will be much heavier than a liter of gasoline due to its greater density.

In 1901, the Third International Conference on Weights and Measures decided to designate a liter as the volume of 1 kg of water at a temperature of 3.98 ° C and an atmospheric pressure of 760 mm Hg. The main difference between the designation of a liter was that in 1901 this unit was considered the volume of a kilogram, and in 1964 - only the volume, while the weight of the substance could be different.

So in the period 1901-1964. the weight of a liter of water was equal to one kilogram, however, subject to the above indicators of temperature and atmospheric pressure. To maintain this equality, it is also necessary that the water be clean. After all, ordinary drinking water contains salts that have a different effect on its density. Is there a difference between swimming in a fresh lake and salt water? Of course, the latter is unlikely to drown. So in order for a liter of water to be equal to a kilogram, the liquid must be distilled, obtained by evaporation and condensation of steam.

How to determine how much one liter of water weighs?

To conduct such an experiment, we need a glass or plastic jar, measuring utensils, electronic scales and distilled water. First you need to determine the mass of the can with the help of scales and write down the resulting figure. Pour a liter of water into a measuring dish, pour into a jar and weigh again. Now you need to subtract the mass of the can - the result will be about one kilogram. Such scales can be used to determine the mass of other liquids, such as milk.

If you want to get a more accurate indicator, you must comply with the conditions of temperature (4˚С) and pressure (760 mm Hg). Then the mass of water will be 998.5 g.

Tap water, when weighed, will show slightly different results than distilled water. The fact is that impurities of heavy metals may be present in tap water, which increases the mass of one liter of water. Special formulas are also used to calculate the mass of 1 liter of water.

Now we know how much 1 liter of water weighs, what factors affect the weight of a liter of water and how to calculate the mass of water experimentally.

The weight of one liter of water weighed at an atmospheric pressure of 760 mm and a temperature of the highest density of water of 4 ° C is approximately 998.5 grams.

The weight of one liter of water is approximately 998.5 grams.

Water is the most unusual liquid on our planet. Indeed, thanks to water, not only life on Earth appeared, but also many important inventions that played a huge role in the development of the technical progress of mankind. It's all about the amazing properties of water, which can easily go from a liquid state to a solid or gaseous state. In everyday life, it often becomes necessary to determine the mass of this liquid - whether it is a chemical experiment in a school chemistry lesson, a production process, or simply household needs. How much does 1 liter of water weigh? The answer to this question is not as simple as it might seem at first glance.

What determines the mass of water?

According to the laws of physics, there is a difference between weight and mass. If we talk about weight, then we mean the force of the impact of a body of a certain mass on the surface. And the term "mass" denotes a quantitative measure of the inertia of the body, which is measured in kilograms. In our article we are talking about the mass of water.

How much does a liter of water weigh? This indicator depends on:

• temperature
• atmospheric pressure
• water conditions (liquid, ice, snow)
• salinity of water (fresh, salty)
• types of hydrogen isotopes

So the weight of water depends on all the above factors, which together determine the value of this indicator.

How much does a liter of water weigh - a bit of history

At different times, the answer to this question was not the same. But the annual consumption of water in the world is extremely large! Therefore, it was necessary to make a general decision regarding the measurement of the mass of the liquid. So, in 1964, during the international conference on weights and measures, a unit was approved, denoting the volume of 1 dm 3 of water - a liter.

However, this unit means, rather, not weight, but volume. In this case, the weight can be completely different - for example, a liter of water will be much heavier than a liter of gasoline due to its greater density.

In 1901, the Third International Conference on Weights and Measures decided to designate a liter as the volume of 1 kg of water at a temperature of 3.98 ° C and an atmospheric pressure of 760 mm Hg. The main difference between the designation of a liter was that in 1901 this unit was considered the volume of a kilogram, and in 1964 - only the volume, while the weight of the substance could be different.

So in the period 1901 - 1964. the weight of a liter of water was equal to one kilogram, however, subject to the above indicators of temperature and atmospheric pressure. To maintain this equality, it is also necessary that the water be clean. After all, ordinary drinking water contains salts that have a different effect on its density. Is there a difference between swimming in a fresh lake and salt water? Of course, the latter is unlikely to drown. So in order for a liter of water to be equal to a kilogram, the liquid must be distilled, obtained by evaporation and condensation of steam.

How to determine how much one liter of water weighs?

To conduct such an experiment, we need a glass or plastic jar, measuring utensils, electronic scales and distilled water. First you need to determine the mass of the can with the help of scales and write down the resulting figure. Pour a liter of water into a measuring dish, pour into a jar and weigh again. Now you need to subtract the mass of the can - the result will be about one kilogram. Such scales can be used to determine the mass of other liquids - for example, milk.

If you want to get a more accurate indicator, you must comply with the conditions of temperature (4˚С) and pressure (760 mm Hg). Then the mass of water will be 998.5 g.

Tap water, when weighed, will show slightly different results than distilled water. The fact is that impurities of heavy metals may be present in tap water, which increases the mass of one liter of water. Special formulas are also used to calculate the mass of 1 liter of water.

Now we know how much 1 liter of water weighs, what factors affect the weight of a liter of water and how to calculate the mass of water experimentally.

Water is perhaps one of the most unusual liquids. Under normal conditions, we can easily observe how it goes into any of the three states - liquid, solid, gaseous. Thanks to water, we had many inventions in the past that played a big role in technological progress. Thanks to water, for example, steam engines appeared. If it were not for the easily accessible steam, who knows which path the technique would take? Water mills, one might say, are the prototype of hydroelectric power plants. Many examples…

The world consumes a huge amount of water every minute. In this regard, some unit of measurement of the amount of liquid was required. In 1964, at the 12th General Conference on Weights and Measures, such a unit was adopted. It was called a liter, and it meant the volume of one cubic decimeter of water. There are two subtle points here.

First, a liter is not a weight, but a volume.. Secondly, since this is the volume, then its weight can be different. Indeed, a liter of gasoline is much lighter than a liter of water because its density is much lower.

Here the question arises - how much does a liter of water weigh? The answer is ambiguous. For example, since 1901, at the 3rd General Conference on Weights and Measures, the liter was defined differently. It denoted the volume of one kilogram of water at a temperature of 3.98 degrees and normal atmospheric pressure of 760 mmHg. Note - in 1901, a liter meant the volume of a kilogram, and in 1964 - just a volume, regardless of weight. In this case, the volume of a liter was 1.000028 cubic decimeters.

We can conclude that from 1901 to 1964, a liter of water weighed exactly one kilogram. But this is only under the specified conditions. Why did they need to be taken into account? But because they directly affect the density of water. At a temperature of 3.98 degrees, water has the highest density. At zero, ice is lighter than water, and at higher temperatures, the density decreases (the weight is less). So is atmospheric pressure - the higher it is, the greater the density of water, respectively, and the weight is also greater.

Another prerequisite for a kilogram of water to give exactly a liter was the purity of the water. As you know, many salts are dissolved in ordinary drinking water, which affect the density of water in different ways. Swimming in fresh and salt lake? And there and there water, and the difference - that is? You can easily drown in fresh water, but if you try hard in salty water. Therefore, distilled water obtained by evaporation and condensation of steam can be taken into account. It contains no foreign impurities. Rain water has approximately the same properties.

If at least one condition is not met, then a liter of water can no longer weigh exactly one kilogram. The greater the deviation, the greater the difference. It is useful to give examples here.

For example, at a temperature of 0 degrees, the density of water is 0.99987 g/ml. This means that a liter of "correct" water will weigh 999.87 grams. At a temperature of 25 degrees - 997.1 grams, at 35 degrees - 994.06 grams, and at a temperature of 90 degrees - 965.34 grams. The difference is quite noticeable.

With increasing pressure, the weight of a liter of water also changes. For example, water is lighter on top of a mountain than somewhere in a mine or at the bottom of the ocean.

And finally, a couple of little-known, but curious facts. If you take water, devoid of gases dissolved in it, then it can be cooled to -70 degrees, and it will not freeze. But as soon as you shake it up or add a piece of ice, it will instantly freeze, and the temperature will rise to 0 degrees!

The same water does not boil if it is heated to 150 degrees. But as soon as you shake it up or add an air bubble, it will instantly boil, and its temperature will be exactly 100 degrees!

Such an amazing ordinary liquid runs from an ordinary water tap ...

When converting kilograms to liters, be sure to clarify what is at stake. Each substance has its own density, and only by specifying the name of the object, we can talk about its mass.

Where did the names come from

If you plunge deep into history, you need to understand that for each individual city, not to mention countries, there were their own concepts of weight, length, time. The measure of weight in every corner of the planet had its own, it was measured in ounces, pounds, measures, pounds and other units, and even the same names did not guarantee the weight match. It was the same with length, ranging from small measurements to distances between cities. But until the end of the eighteenth century, no one would have understood the question “how many kilograms in 1 liter?”, Because such names did not even exist.

Over time, when states came to unity of command, and international trade began to develop actively, a need arose for universal standardization. And if within each individual country the unification of measurements occurred almost simultaneously with the formation of this very country, then the world community approached uniform international standards in the second half of the nineteenth century.

The names "meter" and "kilogram" themselves appeared in France in 1795. After the victory of the French Revolution, the new authorities decided to get rid of everything that looked like a monarchy. The changed names of the months of the year, the days of the week did not last long, but the roots of the new units of measurement of the entire world community originate precisely in France. It was there that they first answered the question “how many kilograms are in 1 liter of water?”.

Metric system

The word "liter" got its name from the old French "litron", which denoted the measure of bulk solids. And the old French term has its roots in ancient Greece and ancient Rome. After the French Revolution, the liter became the new unit of measurement for volume. And in the same 1795, they determined how much a kilogram weighs 1 liter of water. To begin with, we determined how much one reference gram was. He weighed like one cube of melt water with an edge of one hundredth of a meter. And since a gram was a rather small quantity, not convenient for making a standard, a unit one thousand times heavier than a gram was taken as a standard. And, accordingly, the volume was "adjusted" under it. Therefore, to the question “how many kilograms are in 1 liter of water?” The only answer is "One". But the system, which was based on the meter and kilogram, received international recognition only in the last quarter of the nineteenth century, when seventeen states, including Russia, at a meeting in Paris, confirmed the Meter Convention with their signatures.

SI system

The Convention served as the basis for the creation of the International Bureau of Weights and Measures, the purpose of which was precisely the organization of a unified measurement system. This system became the foundation for the emergence in 1960 of the International System of Units (SI). In this system, there was no place for a liter, but bringing measurements to a single standard allows you to answer the question at any time, how many kilograms are in 1 liter of any substance.

Liter measurements

Water was originally taken as the standard of mass in the state of melting ice. After that, the definitions changed, and water at the temperature of the highest density and the normal state of the atmospheric phenomenon became the sample of one kilogram. It follows from this that a substance, in this case water, even in a 1 liter container can have a different weight. Therefore, when asked how many kilograms are in 1 liter, one should also specify atmospheric pressure and water temperature. And again, when it is not about water, the weight of one liter will vary significantly. Thus, the heaviest liquid in its natural state - mercury - is more than thirteen times heavier than water. And, for example, vegetable oil is lighter than water, and if you pour oil into water, an oil film forms on the surface. Given that one liter corresponds to one cubic decimeter, liters can be used to measure not only liquid substances, but also solid ones. The hardest known substance - osmium - is 23 times heavier than water, and the ice that forms when water freezes has a lower density, and therefore is located on the surface of the water. How many kilograms in 1 liter depends on what we measure.

measuring utensils

And where solids are measured in liters, free-flowing ones also appear. And in the old days, it was bulk substances that determined the volume of dishes, wheat served as a standard for this. And in the modern world, measuring utensils come to the aid of all housewives. With its help, you can safely answer the question of how many kilograms are in 1 liter, and by no means water. After all, everything is clear with water. Depending on the need, measuring utensils can measure how much cream, milk, perhaps even flour or cereals are in one liter. Or maybe not in one liter, but only in a glass. Measured utensils will show how many kilograms, pounds or ounces are in 1 liter, depending on which country's recipe will be being prepared at the moment. If you don’t have measuring utensils at hand, reference books will help, which, to the nearest gram, will tell you about the capacity of one liter in relation to all kinds of products.

This article is dedicated to the most common, unique, and well-known substance - water. It is difficult to meet a person who would not know the simplest chemical formula of H 2 O. What is even simpler. But is it so simple, this ubiquitous and familiar water? Alas, this is far from the case.

No matter how pragmatic the words of the famous scientist Einstein sounded: “What can a fish know about the water in which it swims all its life?” - it is difficult not to perceive them, like a stone in your garden. And the statements of the leading men of the scientific world that in our existence nothing happens by chance, and there is a reasonable design in everything, sound quite resonant.

Say: nonsense? We are sure that when considering any new development of IT technologies, the first thought about the person who created it visits you.

But, let's not argue about high matters and return to pressing issues. How often in everyday life do we ask ourselves: how much does a liter of water weigh? For some, this question may seem trivial, and the answer, which lies in the plane of the initial knowledge of physics, is elementary.

But this is just because of the superficial perception of the essence of the issue. It is impossible not to accept the fact that in different periods of the existence of mankind the unit of measurement of the weight of a substance constantly changed its true value.

Some historical data:

• In 1793, a new unit of measurement was adopted in France for the first time - a liter, equated to one cubic decimeter;
• In 1879, the International Committee of Weights and Measures made a decision and equated one liter to one cubic decimeter;
• In 1901, a liter of water was equated to 1 kilogram of water at a temperature of +3.98 ° C and a pressure of one atmosphere. In volume terms, it corresponded to 1.000028 cubic decimeters;
• In 1964, one liter was returned to its former value - one cubic decimeter.

What affects the mass of water?

Let's try to understand the essence of the issue, but first let's make a reservation: one cannot equate the concepts of "mass" and "weight" of water. It's not the same at all. Next, we will talk about "mass", the unit of measurement of which in world practice is recognized as a kilogram, and its standard is stored at the headquarters of the International Bureau of Weights and Measures in Sevres.

At first glance, everything seems to be banal simple. There is a well-known formula for calculating the mass of a substance, defined as the product of two physical quantities: the density of a substance and its volume.

Many now smile ironically. Like, nothing new. So it would be, if not for one but. The physical properties of water are not constant, they tend to change. See for yourself.

Table 1: The dependence of the mass of water on its state of aggregation.

The problem lies in the fact that water has one distinctive property. Water has its maximum density only at freezing point. With any other deviations of the thermal scale, it increases in volume and becomes lighter. That is why ice always floats on the surface, and water pipes burst in winter.

Here are a few more things to think about

Table 2: The dependence of the mass of water on its density.

The density of pure water under normal conditions is considered to be equal to 1000g/m 3 . The addition of various impurities or salts to it contributes to an increase in its density, and, as a result, it becomes heavier.

Atmospheric pressure also affects the change in the mass of water. The resulting effect is opposite to the action of temperatures.

Anticipating the skepticism of the majority of readers, they say, it is impossible to take everything into account, we hasten to reassure. For us, ordinary people, it is difficult and unnecessary.

And therefore, taking on faith the density of water in the liquid state equal to 1000 g / m 3 (at a temperature of 20 ° C and atmospheric pressure of 760 millimeters of mercury), we are guided by the following figures:

• 1 liter of water weighs one kilogram;
• 5 liters of water weigh five kilograms;
• 10 liters of water weigh ten kilograms.

How much water weighs in a jar, glass and bucket - how to determine correctly?

When calculating the weight of water for a particular container, be vigilant. The volume of containers indicated by the manufacturer may fluctuate. This should not be regarded as a reproach to him. GOST stipulates both nominal (for example -500 ml) and full container capacity (for example - 560 ± 15 ml).

To make it clear: 500 milliliters corresponds to the volume of liquid poured to the rim under the wide neck. Thus, we obtain the following values, depending on the volume of containers to be filled:

1. The mass of water poured to the rim of a half-liter can is 500 grams;
2. The mass of water poured to the rim of a liter jar is equal to one kilogram;
3. The mass of water poured to the rim of a two-liter jar is two kilograms.

The situation is different with three-liter jars. If you follow the previous scheme and pour the jar to the rim, then the resulting volume will correspond to 3140 ml, respectively, and the weight of the water will be 3.14 kilograms.

In order to get strictly three liters of water, a three-liter bottle should be filled to the level corresponding to the photo on the right. However, there is an easier way - to measure the exact volume using a liter jar, filling it to the rim.

In this case, the mass of water will be equal to three kilograms.

By analogy, we determine the weight of some water in a 200 gram glass. Pay attention to its design, namely to a clear border at the top. This is a kind of level indicator. The mass of water poured to the rim is 200 grams.

If the glass does not have a rim, then its upper edge serves as a symbolic level. A glass with this design should be filled to the top. In this case, the mass of water will be equal to 200 grams.

Metal and galvanized buckets with a capacity of 12 liters are no exception. At the top of their design is a level indicator. The mass of water poured according to the index corresponds to 12 kilograms.

Another type of containers used to transport various liquid products is canisters or barrels. It is quite difficult or even impossible to control the level of poured water through a narrow neck. In this case, it remains to trust the volume of containers indicated by the manufacturer.

This life-tested method is known to everyone. True, for this you need scales.

Weigh a container of water. Drain the water and weigh the empty container. The difference between these two values ​​will correspond to the mass of water.

Conclusion

Modern human life has long stepped over the limits of the possible and impossible. Measuring containers and electronic scales have become integral attributes of the hostess in the kitchen, which with a high degree of accuracy allow you to determine the volume and mass of any product in any unit of measurement.

In an extreme case, which is characterized by its untimeliness, seek help from the reference literature. In parting, another interesting fact about water: "A person without water can survive no more than three days." But this is more for thought than for intimidation.

Watch the video with an interesting experiment with water, which will once again confirm how little we know about water:

Sometimes, in order to solve some practical problem, housewives have to look for an answer to the question: how many kilograms of this or that product are in a liter?

There is, of course, no single answer to this question. It all depends on the density of this very product.

How to determine the mass of a liquid if its volume is known

The exact mass of the liquid is calculated by the formula:

m = p * v, where:

• m is the mass (in kg);
• p - density (in kg / m 3);
• v - volume (in m 3).

Recall that 1 l \u003d 0.0001 m 3.

However, it is, of course, inconvenient to calculate the mass each time using the formula. Therefore, we present ready-made values ​​of what is the mass of 1 liter of some products.

How many kilograms of water in a liter

The easiest will be with water. The fact is that in 1901, the weight of 1 kg of water was determined by a liter. Although here, too, there are nuances. Firstly, the weight of 1 liter of water is equal to 1 kg only at an atmospheric pressure of 760 mm Hg. Art. and a temperature of 3.98ºС. Under other conditions, the density of water changes and, accordingly, its mass changes. Secondly, it turned out that the mass of the kilogram standard is slightly greater than the mass of 1 liter of water. And since 1964, 1 liter to 1 kg of water, strictly speaking, is no longer attached. But in everyday life, of course, we do not need to go into such details. You can simply remember that 1 liter of water weighs about 1 kg.

How many kilograms of other liquids are in a liter

In one liter:

• milk - 1.029 g;
• kefir - from 1.027 to 1.039 kg (depending on the percentage of fat content);
• juice without pulp - about 1 kg;
• juice with pulp - about 1,050 kg;
• wine - 0.975-0.990 kg;
• alcohol - 0.789 kg,
• sunflower oil - 0.920-0.930 kg.

Read another article on this topic.

One of the favorite questions of both children and teachers at school, addressed to them, is how much does water weigh. And although it would seem that weighing a liquid substance is not a problem, unlike, for example, a gaseous one, the answer to this question is not so unambiguous.

How much does a liter of water weigh?

Most are sure they know how much does 1 liter of water weigh- one kilogram. But in fact, its weight depends on many different factors. First of all, it depends on what phase state we are talking about. And there are three types of water:

• liquid;
• solid (snow, frost, ice);
• gaseous (steam).

Intermediate states include clouds, fog, because they also consist of water droplets. And in all these states, water weighs differently. Its weight also differs depending on salinity.

How much does a liter of water weigh in grams, depending on the state

In its usual liquid state, a standard glass of water (250 ml) will pull 249 grams. A liter of water is really as close as possible to a kilogram - or rather, 998.2 grams. In 12 liters of water - 11.98 kg, and a cubic meter of water will show 998.2 kg on the scales.

Interesting fact: heated water weighs a little less than cold water. But what is paradoxical is that ice weighs much less than water. A glass of ice, in particular, will pull 229 grams, a liter - 917 grams, a bucket of 12 liters - 11 kg, a cubic meter of ice - 917 kg.

But the weight of snow is not so stable - it depends on the density, and on exactly where and when the light fell. A glass of snow can show on the scales from 12 to 113 grams, a liter - from 50 to 450 grams.

If you say how much does 1 liter of water weigh in kg taking into account salinity, a liter of sea water can reach one kilogram 24 grams (at a salinity level of 35 percent). And fresh water weighs the same as mentioned above - 998.2 grams.

Another factor that affects the weight of water is the type of hydrogen isotopes. On this basis, water is distinguished as “light” (ordinary, a liter of which weighs 998.2 grams), “heavy” (1104.2 grams), “super heavy” (1214.6 grams).

If you decide to conduct a practical experiment, then it is not a fact that you will receive the above-mentioned indicators when weighing. After all, even the level of atmospheric pressure can affect the weight of water. True, the indicators will fluctuate slightly, but still the result will be different. It should also be taken into account that in different regions the water has a different chemical composition and contains a different amount of all kinds of impurities.

How much does a liter of water weigh? updated: February 21, 2016 by: Anna Volosovets