How does density affect the transfer in heat?

Answer 1

This is heat loss from the process of expansion. The heat energy in a gas when that gas is expanded through a nozzle (or orifice) is used to expand that gas from a high pressure (compressed) region to a low pressure region causing the gas to cool. The heat is used to produce the expansion.

Answer 2

The density of a material correlates to the proximity of its molecules. That is, in a material of greater density, such as metal, the molecules are closer to one another - than they are in a material of lesser density, such as air. This greater proximity allows heat to be more readily transferred from one molecule to another within the substance (via conduction) than is the case when the molecules are more distant - such as in a gas. To illustrate, consider a spoon that has been left in a pot of boiling water, or a fork left on the edge of a frying pan. In each case, the metal objects (spoon and fork respectively) are soon too hot to touch; yet in both cases, the air around them is not nearly as effected by temperature. While other factors effect the transfer of heat in various materials, the matter of density, as explained above, is one consideration.

Answer 3

Different densities are affected by gravity with the transfer of heat. An increase in temperature will cause a reduction in density.

Answer 4

This is heat transfer due to differences in density.

Answer 5

Convection

Answer 6

Convection