1The two things to know about air
Air carries invisible water — but only so much
There are really just two ideas here. Watch each one move:
Air holds hidden water
The air all around you is carrying water vapor — water so spread out it's invisible. It floated up off oceans, lakes, and puddles.
There's a limit
Air can only hold so much. Think of an invisible bucket. And here's the trick: warm air has a BIG bucket, cold air has a tiny one.
2Two buckets, two skies
Warm air vs cold air, side by side
Same amount of water in each. The only difference is the size of the bucket. See what happens:
The big bucket
Lots of room. All the water stays invisible vapor — clear sky.
The tiny bucket
The bucket can't hold it all. The leftover water spills out as drops.
3Your turn — fill up the air
Pour water into a puff of warm air
Here's one warm puff of air with its big amber bucket-line near the top. Add as much invisible water as you like and watch it float — it all stays hidden vapor, no matter how much you pour in.
4Now the real experiment
What if we cool the air down? ❄️
Take that same muggy puff and send it up high, where it gets cold. You won't add a single extra drop of water. You'll only cool it down. Guess first:
Guess before you find out
You cool the air without adding any water. Remember: warm air has a big bucket, cold air has a tiny one. What does the hidden water do?