Model II:  H+ - NH4+ - SO42− - NO3 - H2O

Köhler Calculation

Here, the model calculates the saturation vapour pressure of water, S, above an aqueous particle for a range of water contents, taking into account the effect of surface curvature (the Kelvin effect). This is often described as a "Köhler calculation", especially when the results are plotted as saturation against wet particle radius. The calculation can also be carried out using the simplified κ-Köhler equation (see ref. 1), by selecting the last of the options in section 1, below.
First, choose the form of output required:   Column     

Now specify the problem in the input fields below.

1.  Select how the chemical composition will be entered.

Moles of ions Moles of each chemical component
Mass of each chemical component Particle radius, and volume fractions of solids
Particle radius, volume fractions of solids, and κ (kappa)

2.  Fill in the form.

Temperature (180 - 330 K):

  Include an organic component in the calculations:   No      Organic compound      Organic acid

To submit your calculation, click here:


(1)  M. D. Petters and S. M. Kreidenweis (2007) A single parameter representation of hygroscopic growth and cloud condensation nucleus activity. Atmos. Chem. Phys. 7, 1961-1971.