Question

Air is filled in a cylinder that has a height of 30cm and a radius of 4cm. The air that is inside the cylinder contains 500 gm of water vapour.

What is the absolute humidity inside the cylinder?

• A. $331.7x{10}^{3}g/m^3$
• B. $221.7x{10}^{3}g/m^3$
• C. $331.7x{10}^{-}3g/m^3$
• D. $200x{10}^{-}3g/m^3$

Answer 1

The correct option is A $331.7x{10}^{3}g/m^3$

Absoulute humidity is the actual amount of the water vapour in grams present in one cubic meter volume of air. It is expressed in in unit grams per meter cube $(g/m^3)$.

So, the volume of air present in the cylinder = ${\mathrm{\pi r}}^{2}h$= (3.14*4*4*30) =$1507.3{\mathrm{cm}}^{3}i.e.,1.507x{10}^{-}3m^3$

Amount of water vapour = 500g

Hence, the absoulute humdity is $\left(500g\right)/(1.507x{10}^{-}3m^3)=337.1x{10}^{3}g/m^3$