Need to determine the mass of any given subject in the absence of scales arises quite often. The simplest weight can be made of a vessel with water, but for this purpose it is necessary to know how many the necessary volume of water weighs.

## Make an experiment

You can determine the weight of 1 l of the distilled water by quite simple experiment. Will be necessary for it: - the distilled water;

- measured ware; - glass or plastic jar;

- electronic scales. The distilled water can be bought in pharmacy or in shop of goods for motorists. Measured ware quite often is on sale in household shops, as well as electronic scales. Weigh to bank, write down or remember its weight. Pour exactly 1 l of water in measured ware. Pour water in bank, weigh. Subtract weight banks. At you the result close to 1 kg will turn out. The most exact weighing turns out at a temperature of 4 °C and pressure of 760 mm of a mercury column. Under these conditions of 1 l of the distilled water has the mass of 998.5 g.

As you will not work with aggressive substances, chemical ware in this case is not obligatory.

## Water is different

Make the same experiment with usual tap water. In the same way weigh to bank, pour water into it, previously having measured volume by means of measured ware. The result will differ, though not much more. Tap water can contain impurity of heavier substances therefore 1 l of such water can weigh slightly more, than the same volume of distillate. You will hardly manage to get heavy water, besides you should not experiment with it definitely. The weight of 1 l of such water will be much more 1 kg.

## Without experiments

It is possible to calculate weight of 1 l of water and without experiments. Remember to what 1 l equals. It is 1 cubic dm, that is 1000 cc. Density of the distilled water is 1 g/cc. The mass of m is equal to density ρ, increased by the volume of V. That is it is possible to calculate it on formula m=V*ρ=1000 cubic sm*1g/cubic cm of =1000 g.

## Other volumes

In life sometimes it is necessary to determine the mass of other volume of water. For example, bucket or glass. It is for this purpose important to know how many liquid is contained by this capacity. The standard glass usually includes 250 ml of water, that is ¼ l. To calculate the mass of this water, it is enough to divide 1 kg into 4. You receive about 250 g. If to weigh more precisely, the mass of water will be 249.6 g. To define how many the water bucket weighs, it is necessary to know also how many liquid is included into this bucket. For example, the amount of usual tap water which is located in a 10-liter bucket weighs about 10 kg, 12-liter – 12 kg, etc.

## Other liquids

By means of scales it is possible to learn, for example, how many the milk liter weighs. As the average density of milk is more than density of water, the liter bottle will weigh a little more than a kilogram.

In a case with milk it is possible to speak only about the average density as milk represents mix of various substances.

As for other liquids, it is the best of all to calculate their weight on a formula as it is not always obviously possible to weigh capacity. Besides, liquids can be and aggressive, work with such in house conditions in the absence of special chemical ware is unsafe, density of acids and alkalis can be found in the table. You will need only to determine the volume of a vessel and to substitute numbers in a formula.