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Vaporization Rate Equation and Calculator

Thermodynamics

Vaporization Rate (Q_m, mass time) from a Liquid Surface Equation and Calculator

The rate of evaporation depends only on the surface area of the liquid and is essentially constant . The rate of condensation depends on the number of molecules in the vapor phase and increases steadily until it equals the rate of evaporation.

Eq. 1
Q_m = [ M · K · A_s · P^sat ] / ( R_g · T_L )

Where:

M = molecular weight of volatile substance
K = mass-transfer coefficient
A_s = area of liquid surface
P^sat = saturation vapor pressure of the pure liquid at T_L
R_g = ideal gas constant
T_L = absolute temperature of the liquid

Reference

• The Fundamentals of Engineering (FE) Handbook, 2020

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