Henry's Law Calculator
Calculate dissolved gas concentration from partial pressure using Henry’s law.
About Henry's Law Calculator
Dissolved gas concentration is directly proportional to partial pressure, which is why doubling the pressure doubles the dissolved amount. Solubility also falls with rising temperature, so the constant is temperature specific. Henry’s law explains carbonated drinks fizzing when opened and nitrogen narcosis in diving, both consequences of pressure-dependent gas solubility.
Formula
Henry's Law
C = P ÷ K_H, so dissolved concentration is proportional to partial pressure
- K_H
- Henry’s law constant, larger for less soluble gases
- partial pressure
- Pressure of that gas alone in the mixture
Worked example
With the default values below, Henry's Law Calculator returns Dissolved Concentration of 0.00026944. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Partial pressure of the gasminimum 0 Pa
- 21,000 Pa
- Henry’s law constantminimum 0 L atm/mol
- 769.2 L atm/mol
- Temperatureaccepts 0–100 C
- 25 C
- Volume of solventminimum 0 L
- 1 L
Results
- Dissolved Concentration
- 0.00026944 mol/L
- Dissolved Concentration
- 8.6221 mg/L
- Moles Dissolved
- 0.00026944 mol
- Partial Pressure
- 0.20725 atm
- Concentration at Double the Pressure
- 0.00053888 mol/L
Step by step
- 1Values used
- 2Henry's Law
- 3Dissolved Concentration= 0.00026944 mol/L
- 4Dissolved Concentration= 8.6221 mg/L
- 5Moles Dissolved= 0.00026944 mol
- 6Partial Pressure= 0.20725 atm
- 7Concentration at Double the Pressure= 0.00053888 mol/L
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Henry's Law calculated?
C = P ÷ K_H, so dissolved concentration is proportional to partial pressure Dissolved gas concentration is directly proportional to partial pressure, which is why doubling the pressure doubles the dissolved amount. Solubility also falls with rising temperature, so the constant is temperature specific.
Why does Henry's Law matter?
Henry’s law explains carbonated drinks fizzing when opened and nitrogen narcosis in diving, both consequences of pressure-dependent gas solubility.
What values do I need to enter?
This calculator takes 4 inputs: Partial pressure of the gas, Henry’s law constant, Temperature, Volume of solvent. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.