How air conditioner works

Can't understand

Could have explained little more simply...

He started fine but complicated everything gradually. Nothing to learn here

Not explained well ..

That's one thing that I have read many times over but still can't get it

You can add a drinking fountain condenser to the incoming water to make it even colder

Expansion valve opens, an increase in volume is a decrease in pressure.

Ya no. Idk what any of that means

They taught us this in HS chemistry

Are they Air conditioners really?