Question

How does the temp of water effect how long a glow stick will glow for?

Answer 1

Yes, Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.

Not sure about the variable one though, sorry!