The transfer of thermal energy from a warmer object to a cooler object.

moved from one place to another.

The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

A current in a fluid that results from convection.

The transfer of energy by electromagnetic waves.

A material that conducts heat well.

A material that does not conduct heat well.

The amount of heat required to raise the temperature of 1 kilogram of a material by 1 kelvin, which is equivalent to 1 C.

The expansion of matter when it is heated.