Kelvin Equation Vapor Pressure Change Calculator

Kelvin Equation Vapor Pressure Calculator

Calculate the vapor pressure over a curved surface using the Kelvin Equation:
\[ \ln\left(\frac{p}{p_0}\right) = \frac{2\gamma V_m}{R\,T\,r} \]

* Enter the flat surface vapor pressure \( p_0 \) (Pa), surface tension \( \gamma \) (N/m), molar volume \( V_m \) (m³/mol), radius \( r \) (m), and temperature \( T \) (K).

Step 1: Enter Parameters

Flat Surface Vapor Pressure, \( p_0 \) (Pa):

Example: 101325 Pa (1 atm)

Surface Tension, \( \gamma \) (N/m):

Example: 0.072 N/m (for water)

Molar Volume, \( V_m \) (m³/mol):

Example: 1.8e-5 m³/mol

Radius, \( r \) (m):

Example: 1e-6 m

Temperature, \( T \) (K):

Example: 298 K (25°C)

Step 1: Enter Parameters

Calculated Vapor Pressure