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sci.isothermal-compressibility Calculator
Calculates isothermal compressibility κT = −(1/V)(∂V/∂P)_T for gases and liquids, measuring volume change per unit pressure at constant temperature. Water has κT ≈ 4.6 × 10⁻¹⁰ Pa⁻¹ at 25 °C — much less compressible than gases; this low compressibility enables water hammer effects in piping.
Inputs
Pressure Mpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Volume Change Pct
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Reference Pressure Mpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
isothermal compressibility kT (1/MPa)
Reference formula or conversion factor shown for context.
bulk modulus K (MPa)
Reference formula or conversion factor shown for context.
kT = -(1/V)(dV/dP)T
Reference formula or conversion factor shown for context.
water at 25°C
The value at the specified point or condition.
steel
Reference formula or conversion factor shown for context.