When a liquid looses enough energy (heat), it turns into a solid.
Heat them.
The process of melting.
heat
liquids turn into gas and solids don't and gas evaporates
with some you can ex) water can turn into ice
All solid can be liquified if the temperature is high enough.
Liquids can through evaporation, and solids can through combustion.
Solids to Liquids (Melting) Liquids turning back into a Solid (Freezing) ((SCF))
solids and liquids
Solids turn into liquids at their melting point.
Both liquids and Solids have definite volumes
Solids and liquids both have fixed volumes.