How they work "Hot Air Balloons"

So this is how A hot air balloon works They fill the balloon with hot air such as “hydrogen” Or “helium” those two Weigh less Then air itself! They also have propane tanks to fire up the Burners.

And then The parachute Valve A self Opening And sealing Flap that allows air to Release Itself at a controlled rate causing the Lift And descent to be slower So that it can avoid “accidents”. Thats how they mainly work! Cya later :)