Conduction is the flow of heat through a body from an area of higher temperature to an area of lower temperature. Molecules in the hot region increase their vibrational energy as they are heated. Their energy is increased and heat is passed on. Heat transfer by convection is the movement of heat by motion of a fluid. This motion can he the result of some force, such as a pump circulating heated water, and is referred to as forced convection.
Radiation is the emission of energy from the surface of a body.
An excellent example of radiative heating is the sun's heat that we experience on Earth. The mass of a body divided by its volume is its average density . Unifying Concepts and Processes When two or more liquids are immiscible they do not mix chemically. Surface tension is temperature dependent. Unifying Concepts and Processes Something that is concave is curved inward like the inner surface of a sphere.