The Mechanical Engineering Handbook



Specific Humidity

Specific Humidity Equation



$$ \omega = \frac{m_w}{m_a} $$ where:

ω   =   Specific humidity   (Dimensionless)

mw   =   Mass of water vapour   (kg)

ma   =   Mass of dry air   (kg)


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Equation Assumptions



  • The system is in steady state.
  • Air and vapor behave as ideal gases
  • There is negligible liquid water.
  • Pressure remains constant.