- - scales;
- - tools to measure the volume;
- - samples of material having a regular geometric shape;
- - table of densities;
- - Calculator.
Decide what it is you need to determine the density.It may be true, moderate, or bulk.True density - the value for the material constant.It represents a benchmark against which to compare other factors.To determine the true density of material is necessary, which is composed of a material without pores and voids.In quality control laboratories in enterprises are usually stored samples of such substances.Their density is calculated u
nder the conditions specified public standards, primarily temperature and humidity.
conducted experiments to determine the average density of matter.For a school or home experiences is best to take the subject of a sufficiently dense and not particularly susceptible to external influences material .Define the scope thereof.The subject of regular shape (eg, a metal cube) can be easily measured.To measure the volume of other small items, take a measuring cup, pour some water there and notice its volume.Put in a glass object and look at what is now the level of the water surface.Subtract the second figure first.This will be the volume of your object.You turned obemometr similar to those used in some laboratories.Move milliliters per cubic centimeter.
Weigh thing.For school experiment sufficient precision to give pharmacy or laboratory scale.Divide the weight by the volume.This will be the density of the material , from which the object is made.
in construction and industrial laboratory samples to determine the average density is usually a specially prepared.They are dried at setting standards of temperature, humidity greatly affects the plotnost.Chashe all materials are porous structure.Normally there is air in the pores.When moisture voids are filled with water.It is heavier than air, the material weighs more, respectively, and its density increases.For example, building materials heated to dry at 105-110ºS.The error weighting should not exceed 0.1 g for the weight less than 0.5 kg and 1 g - for samples with greater mass.
In some cases, using the method of hydrostatic weighing.It is similar to the one you used to determine the density in the laboratory.The sample was first dried and weighed, then saturated with water and moisture from the wash and the sample weighed again.Thereafter, it is immersed in a glass of water.
For materials having a granular or powdery structure used indicator "bulk density".It takes into account the mass of material with voids in a given volume.Bulk density is calculated in the same way as any other, that is, by dividing the weight by the volume.Humidity is determined by state standards, and each bulk material her own.