Which is more dense, humid air or dry air?

Question

Assume the temperature and pressure are the same. Explain your reasoning . Everyone disagrees on this but i don't know who is right!

Answer 1

humid

Answer 2

I did some research and found out that water vapor or water in gas state is less dense than dry air. So I assume that humid air is also less dense than dry air.

Answer 3

As air becomes MORE HUMID (meaning more water vapor molecules) it becomes LESS DENSE. DRY AIR is MORE DENSE than humid air at the same temperature.

Answer 4

Humid air in bathing room is far less dense than dry air on the outdoors provided that their tempertures are equivalent. Pressures are equivalent, temperatures are equivalent, as a result equivalent volumes incorporate equivalent variety of molecules: n = PV/RT yet molar mass of water is eighteen gram, while usual molar mass of air is someplace between 28 of nitrogen and 32 of oxygen. changing area of molecules of air with lighter molecules of water makes humid air much less dense.

Answer 5

I am using grade 9 science and an assumption that might be wrong but....

Density = mass/volume

the mass of humid air is larger since water vapour is included (humidity = water vapour in air)

the volume is the same (maybe?)

therefore humid air is more dense

Answer 6

dry air is more dense. This is because water (H2O) molecules take up more space than N2 or O2 molecules. This is why we have nice sunny days when we have high pressure air masses (dry air) and stormy days when we have low pressure air masses (humid air).

Answer 7

humid.. that is why it is too low, not above us because it is too dense, containing lots of water