Air humidity and the psychrometer
Answers are for parents and teachers.
1
At 25 °C 1 m³ of air contains 16.1 g of vapour. Find φ (ρ₀ = 23.0 g/m³).
φ = 16.1/23.0·100 % = 70 %
2
A room of volume 50 m³ contains 400 g of water vapour. What is the absolute humidity in g/m³?
8
3
If the relative humidity is 40 % and ρ₀ = 20 g/m³, find ρ.
ρ = 0.4·20 = 8 g/m³
4
Why is the air dry in a heated room in winter and why does a damp towel help?
When air warms ρ₀ rises and φ falls; a damp towel evaporates and raises ρ.
5
If dry is 22 °C and wet is 22 °C, what is φ in per cent?
100 %