Which brings us to heat...
Heat is energy in the form of moving atoms or molecules.
- More energy = faster moving molecules = hotter
- Transferred by collisions. (One object to another, one atom to another).
- Some of the energy can be transferred into changing the energy level of an electron. Later fall to lower level releases a photon.
- Hotter atoms have more energy, can cause jumps between farther apart levels. This results in higher energy photons. Also results in more photons at all energies.
- Which leads us to black body radiation….
Blackbody=something that emit and absorbs at every wavelength perfectly (infinite energy levels: most solids, liquids, dense gasses, free electrons, ionized gasses can be approximately a blackbody)