The absolute air humidity is 10 g / m3, find the relative humidity at 12 ° C, 18 ° C and 24 ° C.

Relative humidity:

φ = (ρ / ρ0) * 100%, φ is the value of the relative air humidity (%), ρ is the density of water vapor (absolute humidity, ρ = 10 g / m3), ρ0 is the density of saturated water vapor (g / m3).

t = 12 ºС: ρ0 = 10.7 g / m3.

φ1 = (10 / 10.7) * 100% = 93.46%.

t = 18 ºС: ρ0 = 15.4 g / m3.

φ2 = (10 / 15.4) * 100% = 64.94%.

t = 24 ºС: ρ0 = 21.8 g / m3.

φ1 = (10 / 21.8) * 100% = 45.87%.

Answer: The relative humidity will be 93.46%; 64.94% and 45.87, respectively.