// multi-utility computation suite · offline · instant · precise
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sci.psychrometric-humid-volume Calculator
Calculates humid specific volume (m³/kg dry air) from temperature and humidity ratio for HVAC psychrometric analysis. Humid volume increases with temperature and humidity — at 30 °C and 80% RH, humid volume ≈ 0.894 m³/kg vs 0.842 m³/kg at 0 °C.
Inputs
T Dry C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Rh Pct
Reference formula or conversion factor shown for context.
P Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
specific volume v (m³/kg dry air)
The computed three-dimensional volume.
specific enthalpy h (kJ/kg dry air)
Sample size or count used in the calculation.
humidity ratio W (kg/kg dry air)
The proportional relationship between two quantities.
partial pressure of water vapour (kPa)
The value at the specified point or condition.
v = 0.2871·T·(1+1.6078·W)/P
Reference formula or conversion factor shown for context.