It is slow vapourization process.
This process is called evaporation.
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'boiling' or 'vaporization'
The process is called a phase change or a change of state. This occurs when matter transitions from one physical state, such as solid, liquid, or gas, to another state due to changes in temperature or pressure.
When a solid turns into a gas, it is called sublimation. This is when a substance changes directly from a solid state to a gas state without passing through the liquid state in between.
You have answered the question for yourself. It is called 'MELTING'. Solid to liquid = melting liquid to gas = boiling Solid to gas = sublimation. Gas to liquid = condensation Liquid to solid = freezing.
The change of state from solid to gas is called sublimation. It occurs when a solid transforms directly into a gas without passing through the liquid phase.