by the process in which a solid changes directly to a gas, and it is called sublimation. It occurs when the particles of a solid absorb enough energy to completely overcome the force of attraction between them

Others:

• it is caused by the absorption of heat which provides enough energy for some molecules to overcome the attractive forces of their neighbors and escape into the vapor phase.

• it happens when atmospheric pressure is too low for a substance to exist in liquid form.

• it is the transition of a substance directly from the solid to the gas state, without passing through the liquid state

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