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Change of Phase

A series of free High School Physics Video Lessons from Brightstorm online Physics series..

Evaporation
Evaporation is the vaporization at the surface of liquids. It is related to vapor pressure. When the surface of a liquid gets warm, the additional energy is enough for it to vaporize. Evaporation is seen in the water cycle, as water from rains vaporize from the surfaces of bodies of water.

Condensation
Condensation is the change in phase of a gas upon the surface of a solid due to its loss of energy to that solid. Water droplets often form on the surface of cool substances because the water vapor in the air loses energy when it comes into contact with the cold substance and turns to a liquid.

Boiling
Boiling is the transition of a substance from the liquid to gaseous state of matter. When something boils its vapor pressure equals the atmospheric pressure. At high altitudes things boil at a much lower temperature because there is less atmospheric pressure acting upon them.

Freezing
Freezing is the transition of a substance from the liquid to solid state of matter. Most substances are more dense in their solid form, with the exception of water which expands as it freezes. The opposite of freezing is melting.

Regelation
Regelation is the melting and freezing of a substance due to changes in pressure rather than temperature.

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