| Symbol | Measured in | Description |
|---|---|---|
| p | Pa | pressure |
| V | m3 | volume |
| T | K | temperature |
| N | - | the number of molecules |
| m | kg | mass |
| μ | kg/mol | molar mass |
| ν | mol | amount of substance |
| U | J | the internal energy of the gas |
| Q | J | quantity of heat |
| η | - | efficiency |
The equation of state
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| T=const | isotherm | PV=const | the Boyle–Mariotte law |
| p=const | isobar | V/T=const | Gay-Lussac's law |
| V=const | isochore | p/T=const | Charles's law |
Brownian motion
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Thermodynamics
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Hydrostatics, hydrodynamics
| Symbol | Measured in | Description |
|---|---|---|
| p | Pa | pressure |
| V | m3 | volume |
| m | kg | mass |
| σ | N/m | the coefficient of surface tension |
| ν | m/s | the velocity of the liquid |
| S | m2 | area |
| ρ | kg/m3 | density |
| h | m | the height of the liquid column |
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