Which will weigh the least?
- 98 parts of dry air and 2 parts of water vapour.
- 50 parts of dry air and 50 parts of water vapour.
- 35 parts of dry air and 65 parts of water vapour.
Explanation from PART66Online
Water vapour is lighter than dry air because a water molecule is less massive than the average nitrogen or oxygen molecule it displaces. The mixture richest in water vapour, 35 parts dry air to 65 parts vapour, is therefore the least dense and weighs the least for a given volume.
S
satishpandey asked · 4 Feb 2014
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Community Comments (8)
P
PART66Online
4 Feb 2014
??
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satishpandey
5 Feb 2014
I can't understand the answer? how come it weighs least?
P
PART66Online
5 Feb 2014
What in your opinion is heavier: dry air or water vapour?
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satishpandey
5 Feb 2014
i think dry air ? isn't it as water vapour contains water
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satishpandey
5 Feb 2014
i m nt sure...enlighten me haha
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PART66Online
5 Feb 2014
Yes, dry air is heavier. So why you don't understand the answer?
A
arcana_force
5 Jun 2018
Water vapor weighs less than dry air. Water vapor weighs 5/8 of dry air. Thus more water vapor, the lighter the air is.
G
Greg
12 Jan 2020
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