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Question

What makes water evaporate in vacuum....pls explain at molecular level and also how pressure affects change of state of matter....pls explain at molecular level


Solution

Because of reduction in pressure. This lowers the relative vapor pressure and the water changes phase into a gas. What you are effectively doing, by pumping out the air, from a chamber containing a bowl of water; is removing the gaseous water from the local atmosphere (for the water bowl). Since you removed those gases, the equilibrium must be regained, so water evaporates and fulfills the requirement.

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