When to use this calculator
Find molar volume for an ideal gas at selected conditions. No STP convention is assumed; enter the temperature and pressure explicitly.
Explore the gas laws calculators for other questions in this topic. For a related calculation, use the Ideal Gas Pressure Calculator: Estimate absolute pressure for an ideal gas in a specified volume.
PUTTING IT INTO PRACTICE
Ideal Gas Molar Volume: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Temperature (K) | 300 |
| Absolute pressure (Pa) | 100,000 |
| Result | 24.943388 L/mol |
- Check the input labels and enter the example values above.
- Apply the relationship: Molar volume = RT/P.
- The result is 24.943388 L/mol, rounded for display.
How to interpret your result
No STP convention is assumed; enter the temperature and pressure explicitly.
Gas-law ratios require absolute pressure and kelvin temperature. Hold the quantities specified by each law constant. Real gases can depart from ideal behaviour, especially at high pressure or low temperature.
Frequently asked questions
Can I enter Celsius in a gas-law temperature ratio?
No. Convert to absolute temperature in kelvins first. The Celsius zero point is not absolute zero.
When is the ideal gas molar volume calculator useful?
Find molar volume for an ideal gas at selected conditions. No STP convention is assumed; enter the temperature and pressure explicitly.
How do I use the ideal gas molar volume calculator?
Enter temperature (k), absolute pressure (pa). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Molar volume = RT/P.
What should I check before using the result?
No STP convention is assumed; enter the temperature and pressure explicitly.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: gases and the ideal gas law ↗. This is a topic reference, not an external review or endorsement of this tool.
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