Which state of matter is made up of atoms and molecules that are able to move with complete freedom and collide with each other and with the walls of their container?
A. gas
B. solid
C. liquid
D. plasma
I would say gas, but I don't know enough about plasma to put it out. It's definitely not solids or liquids because their molecules are too close together to move freely. Gas or plasma! Sorry that I'm not sure.
