LeBron Asks: Why does humidity make it feel hotter?

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LeBron Asks: Why does humidity make it feel hotter?발음듣기

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LEBRON: Some reason Miami can be hot.발음듣기

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I'm told the humidity makes it hotter.발음듣기

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Why is this?발음듣기

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KHAN: Excellent question LeBron.발음듣기

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Let's first think about what people are talking about when they even say "humidity"발음듣기

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And there's a couple of ways to think about humidity, but typically when you are the weatherman or in everyday talk people say "Hey it's really humid out there." or "It's high humidity."발음듣기

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They're talking about relative humidity, and it's usually indicated by a percentage.발음듣기

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Let's just think about what the different percentages of relative humidity mean.발음듣기

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So right over here, we have 0%.발음듣기

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So right over here, we have 0% relative humidity.발음듣기

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and over at the extreme other hand, you have 100% relative humidity.발음듣기

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at any given point, the air is some place between 0% humidity and 100% relative humidity.발음듣기

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at 0% relative humidity is essentially saying that there is no water vapor in the air or non-measurable amount of water vapor in the air.발음듣기

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As we go to this molecular view of what it might look like little water droplet maybe on our surface of our skin.발음듣기

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So just to be clear, these are the skin molecules - not even skin cells, which will be the actual skin molecules.발음듣기

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Let's just simplified them as brown circles.발음듣기

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And this right over here - this is the actual water molecules.발음듣기

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So these are water molecules.발음듣기

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And maybe is a drop of sweat, or little water that got dropped on our skin and it is in liquid state you have this hydrogen bond between the molecules that are super strong so allows these molecules to slide pass each other and that's why liquid flows the way it does.발음듣기

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And we've already talked about why sweat makes you cooler but warm up you a little bit.발음듣기

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