Another interesting idea on these lines is a steam airship. Water molecules have less molecular weight than air, so a steam airship gets more lift from steam than from air at the same temperature.
Theoretically it’s possible to make a wet air balloon. Something that floats just because it’s full of very humid air. This is how clouds stay up despite the weight of the water drops. But even in hot dry conditions, the lift is tiny.
Another interesting idea on these lines is a steam airship. Water molecules have less molecular weight than air, so a steam airship gets more lift from steam than from air at the same temperature.
Theoretically it’s possible to make a wet air balloon. Something that floats just because it’s full of very humid air. This is how clouds stay up despite the weight of the water drops. But even in hot dry conditions, the lift is tiny.