9 forms of energy - kinetic, nuclear, elastic, sound, heat, gravitational, light, electrical and chemical.
Conduction - in solids and not so well in liquids
Convection - in liquids and gases
Air in convection gets less dense before it rises. The air then gets denser and sinks.
Heat can be transferred through empty space by Infrared radiation. All hot or warm objects gives off or emit radiation. Infrared radiation can be absorbed or reflected.
The speed of particles moving is related to the temparature as the faster the particles, the hotter it is. The more the particles, the more the energy. The 3 types of heat transfer are convection, radiation, and conduction. The opposite of conduction is insulation
Temperature is the the average speed of the moving particles.
U-values measures the rate of energy transfer through a material.