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# Pressure Energy

The pressure energy in an incompressible fluid volume, like a pressurized tank with water, can be expressed as

ΔE = Δp / ρ                                (1)

where

ΔE = potential energy (J/kg, Btu/lb)

Δp = pressure difference (Pa (N/m2), lb/ft2)

ρ = density of fluid (kg/m3, lb/ft3)

### Example - Pressure Energy in a Water Tank

The pressure in a water tank is 10 bar (106 Pa). With density of water 1000 kg/m3 the potential pressure energy can be calculated as

E = (106 Pa) / (1000 kg/m3)

= 1000 J/kg

## Related Topics

### • Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

## Related Documents

### Energy Accumulated in Heated Water - kWh

The amount of thermal energy stored in heated water.

### Potential Energy - Hydropower

Elevation and potential energy in hydropower.

### Pressure

Introduction to pressure - online pressure units converter.

### Pressure Units - Online Converter

Convert between pressure units like Pa,  bar, atmosphere, pound square feet, psi and more.

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