Clouds are filled with so many water droplets that they’re actually heavy… like 100 elephants heavy or a 747 airplane heavy! So why don’t clouds fall out of the sky? It’s Okay to Be Smart‘s Joe Hanson explains everything from cloud names, to condensation, to what it’s like to parachute through a cumulonimbus cloud.

Related watching: The Water Cycle and NOVA PBS’ Why So Many Cloud Types? Related DIY: Make a cloud in a bottle.

via @PBSDS.

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