Nomenclature
| Symbol | Physical Meaning | Common SI Units |
| A | Area | m2 |
| Cp | Constant-pressure specific heat | J/kg-K or kJ/kg-K |
| Cv | Constant-volume specific heat | J/kg-K or kJ/kg-K |
| e | Total stored specific energy | J/kg or kJ/kg |
| E | Total stored energy | J or kJ |
| F | Force | N or kN |
| g | Gravitational acceleration | m/s2 |
| h | Specific enthalpy | J/kg or kJ/kg |
| H | Enthalpy | J or kJ |
| k | Heat capacity ratio | – |
| K | Spring constant | N/m or kN/m |
| KE | Kinetic energy | J or kJ |
| m | Mass | kg |
| PE | Potential energy | J or kJ |
| P | Pressure | Pa or kPa |
| Q | Heat | J or kJ |
| R | Gas constant | J/kg-K or kJ/kg-K |
| s | Specific entropy | J/kg-K or kJ/kg-K |
| S | Entropy | J/kg or kJ/kg |
| t | Time | s |
| T | Temperature | Kelvin (K) |
| u | Specific internal energy | J/kg or kJ/kg |
| U | Internal energy | J or kJ |
| v | Specific volume | m3/kg |
| V | Volume | m3 |
| V | Velocity | m/s |
| W | Work | W or kW |
| x | Quality of saturated liquid-vapor two-phase mixture | – |
| z | Height | m |
| Z | Compressibility factor | – |
Greek Symbols
| Symbol | Physical Meaning | Common SI Units |
| ρ | Density | kg/m3 |
| η | Efficiency | – |
