Afixed mass of gas will have a fixed volume. true or false

The softest and hardest minerals are: softest hardest

This is the number of complete movements of a wave per second.

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.