Do you really know how much is a kilogram per liter?

The question of how many kilograms in 1 liter, it may seem to a man ignorant enough stupid. "Of course one!" - he will answer. And he will be mistaken. We used to think that if the measure of the weight of solid (or bulk) substances is measured in kilograms, then the liquids are in liters. But this is not so. Liters are measures of volume for liquids. It is equal to only a cubic meter. This is such a measure of measurement of the coverage of solid substances - firewood, for example. That is, it is such a conventional cube, each facet is 10 cm. Of course, no one comes to mind to compare a kilogram with a meter!

However (according to Archimedes' law), the volume is directly related to weight. Therefore, the question: "How much is a kilogram per liter?" Is not so idle. Just need to take into account another measurement parameter, namely the density of matter, in this volume inserted. The higher this index, the more weight the substance will have. Let's recall the experience that was demonstrated to us in the second grade at the lesson of natural history. Two empty identical cans were placed on the scales. A candle was lit under one of them. The fire heated the air, the density of which decreased at the same time. The bank with cold air became heavier.

You can also associate volume and weight: if you drink daily a liter of water more than the daily rate, then after a while you can lose two kilograms of weight. To this conclusion came the scientists of the Virginia Institute of Technology, based on the research. But how to calculate how much is a kilogram per liter? By a simple formula: the weight is equal to the density multiplied by the volume. What does this give us in the conditions of life? We do not know, for example, the density of sour cream or honey. In addition, this indicator is very volatile, because it depends even on weather conditions!

Yes, the density of matter can vary from temperature, humidity and atmospheric pressure. As a result, this will affect how much per liter kilogram. Remember one more experience from school science: hot bodies increase in volume. Yes, by the way, and a clogged bottle full of water can burst if put it to the 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 kilograms of sugar, vegetable oil, flour and milk.

Going to the market and asking prices for the products of gardeners who are usually sold in jars, we often wonder how many liters a kilogram of berries. After all, besides the density of the "Kalinka-Malinka" itself, other factors play a role. For example, the number of gaps between berries. That is, the larger the fruit, the more air in the pot you will be sold. 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 kilos in a 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 is 760 mm Hg.

If at least one of these parameters is broken 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.