This is Earth. No vacuum. Make a google search at least: same true mass (weighed in a vacuum) of "hot air is lighter", of liquid air is heavier here (Archimedes

This is Earth. No vacuum. Make a google search at least: same true mass (weighed in a vacuum) of "hot air is lighter", of liquid air is heavier here (Archimedes Law, applies to iron and feathers too). Those are facts - whoever argue with facts (parent downvoted) . . .