Generally, a solid first changes into liquid and then to gas on heating, but some solids directly change into gas. This process is called __________.
evaporation
precipitation
sublimation
condensation
Name the temperature at which:
(a) a liquid changes into a gas (b) a solid changes into a liquid
The process by which a gas directly changes into solid-state on cooling, without changing first into the liquid state is called
16. The process in which a solid directly changes into a gas.