When a solid changes to a liquid it is called what?

Liquids are easy to compress.

When a gas changes into a liquid it is called what?

The particles of a gas are packed tightly together.

When solids reach their melting points they become what?

Plasma is a state of matter.

When a gas reaches its condensation point it becomes a what?

Solids do not take the shape of the container they are in.

What is it called when a solid changes directly into a gas?

Gases are hard to compress.