Density, the ratio of the mass of a substance to its volume. The greater the mass per given volume, the greater is the density. Lead, for example, has a greater density than aluminum because a given volume of lead weighs more—that is, has a greater mass—than an equal volume of aluminum. The density of a material depends not only on its composition, but also on its temperature and, especially in the case of gases, on pressure. Density is commonly expressed in such units as pounds per cubic foot, grams per cubic centimeter, and grams per liter.
In general, when a substance changes from a gas into a liquid or from a liquid into a solid, its density increases. A notable exception is water; its density decreases when it changes from a liquid into a solid.
Specific gravity is the ratio of the density of one substance to that of another substance used as a standard. The most common standard for solids and liquids is distilled water at 39.2 F. (4 C.), which has a density of 62.4 pounds per cubic foot, or 1 gram per cubic centimeter. The standard for gases is usually air, at the same pressure and temperature as the substance being rated. .)
Here is a video !
Here is A PPT File !
I learnt a lot from this Chapter ... Its damn COOL !
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