Liquid, as well as any other substance, has the volume and weight. Respectively, dly measurements of its quantity are used both cubic measures, and a weight. To define how many the liquid occupying any given volume weighs it is not obligatory to weigh it at all, especially such opportunity is not always.
Simple experiment
Water volume is measured most often in liters. It is simple to weigh 1 l of the distilled water. Are for this purpose necessary: - electronic scales; - measured ware;
- bank; - water.
The distilled water can be bought in shop where sell auto parts and other goods for motorists and also in pharmacy. It is better for bank to take glass. Chemical ware for experiments with water is not obligatory. Weigh an empty jar. Pour in it exactly 1 l of water and again weigh. Subtract the first from the second result. At you the mass of water will turn out. And you make sure that it is equal to 1 kg. If you have water from under the crane or from a well, it can weigh a little more at the expense of the salts dissolved in it. The error is usually insignificant, and for school experience the difference can be neglected.
We translate cubic measures
Remember what 1 l is equal to. It is equal to one thousand cubic centimeters, that is one cubic decimeter. In turn, in one cubic meter – one thousand cubic decimeters. That to make sure of it, it is enough to cube a ratio of 1 m = 10 dm. How many 1 dm3 weighs, you already calculated. Remember what the ton is equal to. It is equal to 1000 kg. That is one ton 1000 dm3 of water weigh. It turns out that 1 cubic meter of the distilled water will weigh exactly 1 ton.
Other liquids
Distilled driving is some kind of standard which can use when weighing other objects. The bank can turn with water into the weight. Filling in it a certain amount of water, you will know for sure how many it weighs so you can use such "weight" and for work with mechanical scales. To calculate a ratio of weight and volume of other liquids so just it will not turn out. It is necessary to know one more size – density. It is possible to find it in the table of density of various chemicals. Calculate density on a formula ρ=m/V where m is weight, and V – volume. To find weight, it is necessary to increase density by volume. On the same formula it is possible to calculate also weight of 1 m3 of water. Density of water is equal to 0.9982 g/cm³, but when calculating which are not demanding very big accuracy, it is usually taken for 1 g/cm³. Having substituted this value in a formula, you receive m = ρ*V = 1 g/cm³ * 1000000 cm3 = 1000000 g = 1000 kg = 1 t. In the same way it is possible to calculate also the mass of a solid body if it cannot be weighed, but it is possible to measure volume and it is known of what substance it is made. For the calculation of body weight consisting of several parts it is possible to take average density, but calculations will be with a big error.