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Combined Gas Law Calculator

Chemistry
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Calculates the relationship between pressure, volume, and temperature of a gas using the combined gas law: (P1 * V1) / T1 = (P2 * V2) / T2. This calculator allows you to solve for any one of these variables, given the others.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Initial Pressure (P1), Initial Volume (V1), Initial Temperature (T1), Final Pressure (P2), Final Volume (V2), Final Temperature (T2), and Solve For in the units shown.

Step 2

Read Calculated Value in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Standard Conditions (STP)

Initial Pressure (P1): 1 atm; Initial Volume (V1): 22.4 L; Initial Temperature (T1): 273.15 K; Final Pressure (P2): 2 atm; Final Volume (V2): 11.2 L; Final Temperature (T2): 273.15 K; Solve For: Final Temperature (T2)

Calculated Value: 273.15 See inputs

Boyle's Law (Constant Temp)

Initial Pressure (P1): 1 atm; Initial Volume (V1): 10 L; Initial Temperature (T1): 298.15 K; Final Pressure (P2): 2 atm; Final Volume (V2): 5 L; Final Temperature (T2): 298.15 K; Solve For: Final Volume (V2)

Calculated Value: 5 See inputs

Charles's Law (Constant Pressure)

Initial Pressure (P1): 1 atm; Initial Volume (V1): 5 L; Initial Temperature (T1): 273.15 K; Final Pressure (P2): 1 atm; Final Volume (V2): 10 L; Final Temperature (T2): 546.3 K; Solve For: Final Temperature (T2)

Calculated Value: 546.3 See inputs

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