KEVOS® MAKEOS · Pneumatics
Gas Volume at Pressure and Temperature
What volume does this gas occupy at the new pressure and temperature?
Ideal gas conversion of a gas volume or flow between two sets of pressure and temperature, including gauge-to-absolute conversion and free-air to compressed volume.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Volume or flow at state 1 | m³ or m³/min | Volume or volume flow at the first condition. |
| Pressure at state 1 (gauge) | bar | Gauge pressure at the first condition (0 for free air). |
| Temperature at state 1 | °C | Temperature at the first condition. |
| Pressure at state 2 (gauge) | bar | Gauge pressure at the second condition. |
| Temperature at state 2 | °C | Temperature at the second condition. |
| Atmospheric pressure | bar | Local atmospheric pressure (1.013 bar at sea level). |
Method and formulas
- Absolute P = gauge + atmospheric; T in kelvin = °C + 273.15.
- V₂ = V₁ × (P₁ ÷ P₂) × (T₂ ÷ T₁).
- Example: 1 m³ of free air at 20 °C occupies 0.13073 m³ at 7 bar g and 30 °C.
Limitations
- Ideal gas; at very high pressures or low temperatures real gases deviate.
- Humidity and condensation are not considered.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Convert free air delivery to compressed volume
- Correct a gas flow to reference conditions
- Estimate the pressure in a heated closed vessel
Who it is for
- Maintenance engineers
- Energy and utilities managers
- Design engineers
What you get
- Volume or flow at state 2
- Absolute pressures and temperatures
- Volume ratio
Interpreting the result
- Always state the reference conditions with a gas volume or flow.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 3032–3041. Topic reference; no source tables or recommended settings are reproduced.
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