Rain In The Room


Rain after sultry days makes the inside of the windowpane suddenly sweat. You can distinguish the tiny water droplets through a magnifying glass. Where do they come from?

After it has been raining the air outside cools sharply because the water evaporates and thus uses heat. The warm air in the room, which is saturated with water vapor, especially from cooking, cools down only slowly on the windowpane. But cold air cannot hold so much moisture as warm air, and therefore loses some of it on to the pane. It forms water droplets - exactly as when it is raining out-of- doors and moist, warm air meets cold air.

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