Heat can be thought of as the motion of particles within a substance. This energy of motion is known as kinetic energy. Heat, energy, always moves from areas of high concentration to areas of low concentration (differences in temperature). The troposphere is heated from the ground up by the re-emitting of solar energy. This heat emitted from the ground is absorbed by gases in the troposphere known as the greenhouse effect.
Energy (heat) is transmitted by three processes:
- radiation- energy from the sun reaches the Earth through this method.
- convection - the transfer of heat by the movement of mass in a fluid (water or air).
- conduction- transfer of heat by molecular movement- one molecule hitting another.