For each of the situations below identify what remains mostly constant (unchanged)

A) Temperature B) Volume or C) Pressure:
Steam is generated inside a popcorn kernel _____ ( B) This is my answer I just need help with the rest.
An inflated balloon is put in a freezer ______
Your diaphragm expands the lungs as you breath _____

An inflated balloon is put in a freezer _____ (A) Temperature

Your diaphragm expands the lungs as you breathe _____ (B) Volume