Relative Humidity Practical

Theory & Method

Determination of relative humidity of air using a polished calorimeter.

Relative Humidity = (p₀ / p) × 100%
Surface Clear (No Dew)

Experiment Controls

Real-Time Readings

Readings & Calculations Worksheet

Parameter Symbol Value
Room Temperature θR
Temp at which dew deposits θ₁
Temp at which dew vanishes θ₂
Mean Dew Point (θ₁ + θ₂) / 2
SVP at Dew Point p₀ (mmHg)
SVP at Room Temp p (mmHg)
Calculated RH (%) RH

Saturated Vapour Pressure (SVP) Reference Data

Temp (°C) SVP (mmHg) Temp (°C) SVP (mmHg)