Where does each individual band of color come from? (for example, why does Helium release a red, orange, yellow, green, and blue emission line from a single atom)

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the dissolution of polymer can be thermodynamically described in 2 steps.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.