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Gas Collected Over Water Vapor Correction Calculator

P_dry = P_total − P_H₂O — correct for water vapour pressure.

Corrects the total gas pressure for water vapour when a gas is collected over water, then calculates moles from dry pressure, volume, and temperature using the ideal gas law.

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Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

P_dry = P_total − P_H₂O; n = P_dry·V / (R·T)

In depth

Corrects the total gas pressure for water vapour when a gas is collected over water, then calculates moles from dry pressure, volume, and temperature using the ideal gas law.