Vaporization and Condensation

Lesson 1, Topic 1
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Vaporization and Condensation

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Directions: Before you start, listen to part of a talk in a chemistry class.

*Vocabulary is sometimes provided in written form when it may be unfamiliar to the student but essential for understanding the lecture

gas phase
condensed phase

Vaporization and Condensation - Transcript

When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas-phase molecules move randomly about, they will occasionally collide with the surface of molecules of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor in the container changes. The vapor in the container is then said to be in equilibrium with the liquid. Keep in mind that this is not a static situation, as molecules are continually exchanged between the condensed and gaseous phases.