eli5 why does a shower steam up when the water isn’t at boiling point?
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Steam isn’t visible. Water droplets scattered in the air are. When you boil water in a kettle look closely at the opening. There is a gap between the mouth of the kettle and the cloud of what people mistakenly call steam. The gap is where the steam is, but it quickly cools below 100C and condenses as water droplets. Those droplets are what you are seeing in the shower and they are fine to exist between 0 and 100C at normal pressures.
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