When the forces holding the crystal lattice together brake: becomes liquid

Temp. at which a liquid is converted to a solid

Process of solids changing to a gas w/o becoming a liquid

Process of gas changing directly to a solid . 

The process of a liquid changing to a gas

The process of a gas changing to a liquid

As the volume increases, the pressure decreases

As kelvin temp. increases, its volume increases. 

As the temp. increases, its pressure increases.

The number of moles of gas are increased & the volume of gas increases