How does a gas become a liquid?

Question

Thanks!

Answer 1

it gets cooler than it's boiling point
for instance, your pot of boiling water, the molecules get excited by the heat and expand to a gas, rise to the lid, and the lid is cooler because the other side is in the cooler air, so the steam condenses on the lid and drips down the inside of the lid

Answer 2

It becomes a liquid through condensation.