The National Science Resources Center says that density is one of the characteristic properties of an object, which, when compared to the densities of other known objects, allows an investigator to identify the materials from which it is made. While several materials may have similar densities, this property allows an individual to rule out unlikely candidates and use further tests to confirm identification.Know More
Reference.com defines density as the ratio of an object's volume to its mass. Several factors affect density and it sometimes varies slightly from one sample to the next. Density varies with temperature as many materials expand upon heating. In addition, the density of a gas increases as pressure increases. When speaking of the density of a gas, scientists often specify the standard temperature and pressure to eliminate these variables. Managing these conditions is essential if one is using density to identify a gas.
Specific gravity relates to density. It is the ratio of the material as compared to water and carries no units. About.com says objects with specific gravities greater than 1 sink in water, while those with a specific gravity of less than 1 float. This quick test of nonsoluble items helps to eliminate possible choices when identifying a solid.Learn more about Thermodynamics
Good insulators are materials that do not allow heat to pass through them. They are also materials that either slow down or do not allow transfer of electricity through them.Full Answer >
Common heat-absorbing materials include precious metals such as silver, copper and gold. Materials that conduct more heat are capable of absorbing heat before transferring it. The most conductive naturally occurring material is diamond, followed by other pure metals. The most conductive material known is helium II, a superfluid isotope of helium that has over 45 times the absorption of natural diamonds.Full Answer >
Many metals, like silver, copper, gold and aluminum, are good thermal conductors. Thermal conductors are materials that heat passes through easily. Conduction, or the transfer of heat, can take place within a single material or between two objects.Full Answer >
As temperature increases, the density of liquids and gases decreases; as temperature decreases, the density increases. Density is the amount of mass per unit of volume.Full Answer >