Helium
Crystallines can liquefy under pressure if it is sufficiently high. Generally the opposite happens where they become more dense and compressed as the pressure increases.
The critical temperature of a gas is the temperature at or above which no amount of pressure, however great, will cause the gas to liquefy.
Other words for melt are thaw, defrost, liquefy, and dissolve.
evaporation and condensation or just condensation
All forms of gas will liquefy at a sufficiently low temperature.
All forms of gas will liquefy at a sufficiently low temperature.
You can liquefy metal by heating it to a high enough temperature.
Maybe
the suffix is fy
Helium
Yes
sandy soils
Cool the gas sufficiently and it will liquefy.
Depends which gas
liquefy, dissolve, thaw, soften
My blender will liquefy fruits.