Thermodynamic Property Calculator v1.0
Compute key thermodynamic properties for ideal gases using inputs like pressure, temperature, and volume.
Note: All calculations are performed on a mass basis (per kg) for consistency.
Input Parameters
Results
Basic Properties
Pressure (P):
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Volume (V):
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Temperature (T):
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Density (ρ):
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Energy Properties (per kg)
Internal Energy (u):
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Enthalpy (h):
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Entropy Change (Δs):
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Gas Properties
Specific Heat at Constant Volume (Cv):
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Specific Heat at Constant Pressure (Cp):
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Heat Capacity Ratio (γ):
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Specific Gas Constant (R):
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Total Values
Total Internal Energy (U):
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Total Enthalpy (H):
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Key Equations Used
Ideal Gas Law (Mass Basis)
Pv = RT or P = ρRT
Where:
- P: Pressure (kPa)
- v: Specific volume (m³/kg)
- ρ: Density (kg/m³) = 1/v
- R: Specific gas constant (kJ/kg·K)
- T: Temperature (K)
Internal Energy (u)
u = Cv·T
Where:
- u: Specific internal energy (kJ/kg)
- Cv: Specific heat at constant volume (kJ/kg·K)
Enthalpy (h)
h = Cp·T
Where:
- h: Specific enthalpy (kJ/kg)
- Cp: Specific heat at constant pressure (kJ/kg·K)
Entropy Change (Δs)
Isothermal Process: Δs = R·ln(v₂/v₁)
General Process: Δs = Cp·ln(T₂/T₁) - R·ln(P₂/P₁)
Where:
- Δs: Specific entropy change (kJ/kg·K)
- v₁, v₂: Initial and final specific volumes
- T₁, T₂: Initial and final temperatures
- P₁, P₂: Initial and final pressures
Educational Guide
Thermodynamic Properties Explained
| Property | Symbol | Unit | Description |
|---|---|---|---|
| Pressure | P | kPa | Force exerted by gas molecules per unit area of container walls |
| Specific Volume | v | m³/kg | Volume occupied by unit mass of the gas |
| Temperature | T | K | Measure of average kinetic energy of gas molecules |
| Internal Energy | u | kJ/kg | Energy stored within gas molecules per unit mass |
| Enthalpy | h | kJ/kg | Heat content per unit mass at constant pressure (h = u + Pv) |
| Entropy | s | kJ/kg·K | Measure of system disorder per unit mass |
About the Thermodynamic Property Calculator
This tool calculates fundamental thermodynamic properties for ideal gases based on standard thermodynamic principles.
Key Changes in v1.0 (Fixed)
- All calculations now consistently use mass-specific properties (per kg)
- Removed molar calculations that caused confusion
- Added density and specific gas constant outputs
- Separated specific (per kg) and total values in results
Caution: For real gases or high-pressure/low-temperature conditions, use property tables or real gas equations of state (like Van der Waals or Peng-Robinson).