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Van Der Waals Gas Pressure Calculator

Use this online van der waals gas pressure calculator with labeled inputs and a worked example. P = nRT/(V−nb) − a(n/V)².

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real gas pressure calculator online

Use van der waals gas pressure calculator online with the chemical quantities shown below. Uses L, bar, mol and kelvin with R = 0.08314462618 L·bar/(mol·K). User supplies gas constants.

How to use it

Enter Gas amount (mol). Set Absolute temperature (K), Gas volume (L), Attraction constant (L²·bar/mol²), Excluded volume constant (L/mol). Select Calculate, check the result units, then copy or download the JSON result.

Options and example settings

OptionChoices / valueExample default
Gas amount (mol)Main input. Decimal or scientific notation. Positive values only. 1
Absolute temperature (K)Option. Decimal or scientific notation. Positive values only. 300
Gas volume (L)Option. Decimal or scientific notation. Positive values only. 1
Attraction constant (L²·bar/mol²)Option. Decimal or scientific notation. Zero or positive values. 1.39
Excluded volume constant (L/mol)Option. Decimal or scientific notation. Zero or positive values. 0.0391

Calculation method

P = nRT/(V−nb) − a(n/V)²

Worked examples

Worked case for van der waals gas pressure calculator. Uses L, bar, mol and kelvin with R = 0.08314462618 L·bar/(mol·K). User supplies gas constants.

Van Der Waals Gas Pressure Calculator — example with explicit inputs

Settings: Absolute temperature (K): 300; Gas volume (L): 1; Attraction constant (L²·bar/mol²): 1.39; Excluded volume constant (L/mol): 0.0391

Input:

1

Expected result for the example input and options:

Output:

{
  "pressure_bar": 24.56835971949185
}

Limitations and common mistakes

  • Uses L, bar, mol and kelvin with R = 0.08314462618 L·bar/(mol·K). User supplies gas constants.
  • Match every input to its displayed unit; scientific notation such as 1e-6 is accepted.
  • Check substance identity, reaction coefficients and concentration conventions. Numerical output does not verify experimental conditions.

Frequently asked questions

How can I use real gas pressure calculator online?

Enter Gas amount (mol). Set Absolute temperature (K), Gas volume (L), Attraction constant (L²·bar/mol²), Excluded volume constant (L/mol). Select Calculate, check the result units, then copy or download the JSON result.

Which model does Van Der Waals Gas Pressure Calculator use?

P = nRT/(V−nb) − a(n/V)². Uses L, bar, mol and kelvin with R = 0.08314462618 L·bar/(mol·K). User supplies gas constants.

Technical references

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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