The question of how many kilograms per 1 liter may seem rather stupid to an ignorant person. "Of course one!" - he will answer. And make a mistake. We are used to thinking that if a measure of the weight of solid (or bulk) substances is measured in kilograms, then liquids in liters. But this is not so.
A liter is a
measure of volume for liquids. It is equal only to a cubic meter. This is such a measure of the coverage of solids - firewood, for example. That is, this is such a conditional cube, each face of which is 10 cm. Of course, it does not occur to anyone to compare a kilogram with a meter!
However (according to Archimedes' law) volume is directly related to weight. Therefore, the question: “How many kilograms are in a liter?” not so idle. Just need to take into account another measurement parameter, namely the density of the substance in this volume inserted. The higher this indicator, the more weight the substance will have. Let us recall the experience that was shown to us in the second grade at a natural history lesson. Two empty identical cans were placed on the scales. A candle was lit under one of them. Fire heated air, the density of which decreased. The can of cold air was getting heavier.
You can already relate volume and weight: if you drink daily per liter of water more than the daily norm, then after some time you can lose two kilograms of weight. This conclusion was made by scientists at the Virginia Institute of Technology, based on research. But how to calculate how many kilograms are in a liter? According to a simple formula: weight is equal to density times volume. What does this give us in the domestic environment? We do not know, for example, the density of sour cream or honey. Moreover, this indicator is very inconsistent, because it even depends on weather conditions!
Yes, the density of a substance can vary with temperature, humidity and atmospheric pressure. As a result, this will affect how many kilograms are in a liter. Recall another experience from school science: hot bodies increase in volume. Yes, by the way, and a corked bottle full of water can burst if exposed to frost. In a kitchen, it’s good to have a special measure. She looks like an ordinary jug. However, on the walls of this vessel there are marks indicating the level of a kilogram of granulated sugar, vegetable oil, flour and milk.
Going to the market and asking about the products of gardeners, usually sold in jars, we often wonder about how many kilograms of berries are in a liter. Indeed, here, in addition to the density of the “Kalinka-raspberry” itself, other factors play a role. For example, the number of gaps between the berries. That is, the larger the fruit, the more air in the bank they will sell you. Thus, a liter contains 600 g of raspberries or blackberries, 800 g of cherries, cherries and blueberries, 850 g of gooseberries, 550 g of cranberries and only 400 g of strawberries.
Well, how many kilograms per liter of water? In 1901, the Third General Conference on Measurement Standards established that a liter of water is equal to a kilogram only if:
- distilled liquid;
- its temperature is 3.98 degrees Celsius;
- the atmospheric pressure in this case is 760 mmHg.
If at least one of these parameters is violated and does not coincide with the others, the mass of a liter of water is less than a kilogram: at zero temperature it weighs 999 g, at 35 degrees Celsius - 994 g, at 90 degrees - 965 g.