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What causes hot water in a bottle to fog up?

Updated: 8/17/2019
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14y ago

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If you take hot water and put it in a bottle some of the water will vaporize into the air and then due to the colder environment around the bottle condense against the bottle walls leaving the "fog" effect on the edges. What your actually seeing is tiny water droplets on the side of the bottle.

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14y ago
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Q: What causes hot water in a bottle to fog up?
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Make fog in a bottle with hot waterIn this case the condensation is caused by the temperature variation between simple ice and hot water. 1. Fill up the jar or bottle completely with very hot water and let it stay there for about 60 seconds. 2. Pour out all but about an inch of the hot water. 3. Put a strainer or bag over the top of the jar. 4. Place ice cubes in the strainer or plastic bag. 5. Fog will form as the hot water vapor from the bottom of the bottle contacts the cold air created by the ice cubes and begins condensation.and there ya go. hehe


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