/en/calculadora-ponto-de-orvalho
Dew point and mould risk calculator
If the wall is colder than the dew point, water from the air condenses on it. Mould shows up before that: with humidity at the surface above ~80% for a few days.
Dew point
13.5 °C
Humidity at the wall
100%
Condensation on the wall
The wall is at 13.0 °C, below the dew point. There is water on the surface right now.
How we calculate it (Magnus formula)
γ = ln(RH/100) + b·T/(c+T)
Td = c·γ / (b − γ)
b = 17.62 · c = 243.12 °C
RH at the wall = e(air) / e_sat(T_wall)