Vapor pressure is defined as:

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Multiple Choice

Vapor pressure is defined as:

Vapor pressure describes how readily a liquid tends to escape into the vapor phase. At a given temperature, molecules continuously leave the liquid and, once enough vapor collects, it exerts pressure in equilibrium with the liquid. So, the statement that vapor pressure is the tendency of a substance to evaporate captures the core idea: a substance that evaporates more easily has a higher vapor pressure. The other descriptions refer to density, mixing of phases, or flammable concentration limits, none of which define vapor pressure.

Vapor pressure describes how readily a liquid tends to escape into the vapor phase. At a given temperature, molecules continuously leave the liquid and, once enough vapor collects, it exerts pressure in equilibrium with the liquid. So, the statement that vapor pressure is the tendency of a substance to evaporate captures the core idea: a substance that evaporates more easily has a higher vapor pressure. The other descriptions refer to density, mixing of phases, or flammable concentration limits, none of which define vapor pressure.

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