Discussion
When ice directly converts into vapour, it is known as:
Answer: B
The direct change from ice to vapour is called sublimation.
Sublimation is a phase change from solid straight to vapour without passing through the liquid state. For water it occurs at pressures below the triple point pressure, about 0.611 kPa, which is why snow and ice slowly vanish in cold, dry air.
Vaporization is liquid to vapour, saturation describes the condition at which a phase change takes place, and the triple point is the single state at which all three phases coexist.
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