you need
  • scales, and a hydrometer.
known that the density clean water is 1 g / cc or 1,000 kg / cm.However, the various impurities which may be contained in the best natural solvent can significantly change this value.For example, sea water has a somewhat higher density , than pure.To find density water , measure its mass.For this Collect a sample of water , density is determined.First, weigh the empty vessel in which to be measured, then fill it with water and weigh again.The difference in mass filled with water and an empty vessel is equal to mass water .Measurement of better produce in grams.
Find the volume of water .For this design it geometrically if the water poured into the vessel a regular shape.If the vessel has a parallelepiped shape, multiply it by the length by the width and the depth of water measured in centimeters.If the vessel is cylindrical in shape, measure its diameter, and calculate the area of ​​the base by multiplying the square of the diameter by 3.14 and dividing by 4. Multiply the area of ​​the cylinder to the height of the liquid column, the result is the volume of water in the vessel.In that case, if available graduated cylinder, pour the water samples taken in and on a scale previously defined price division, find the volume of liquid.Measure the value in ml or cc, which are equivalent to each other.
mass balance measurements on selected samples of water to divide the resulting volume ρ = m / V.When so measured values ​​obtained density, measured in grams per cubic centimeter.To get this value in kilograms per cubic meter, multiply the result by 1000.
To measure the density of the liquid hydrometer, immerse it in a container with water so that it does not swing his sides and bottom,freely floating on the surface.On a scale on its upper part, determine the density water .If you know what substance it is dissolved, changing the scale, using a hydrometer, get his concentration.