Summary
The bulk modulus or elasticity is a measure of the resistance to compression of a substance. This article presents the bulk modulus for various liquids.
Definitions
: | Isothermal bulk modulus of elasticity | |
: | Isentropic or Adiabatic bulk modulus of elasticity |
Bulk Modulus for Liquids
The bulk modulus for a liquid is defined as the ratio of a change in pressure to the relative change in volume. Common uses for the bulk modulus include:
- Calculation of the speed of sound for liquids, which useful for applications where pressure waves are important like dynamics modelling and surge analysis.
- Determination of the lag in response time for hydraulic systems.
Properties for various liquids at 1 atm and 20°C are shown in the table below.
Liquid | Isothermal MPa | Isentropic MPa |
---|---|---|
Liquid | K(t) | K(s) |
Ethanol | 896 | 1070 |
Benzene | 1060 | 1540 |
Biodiesel (from Rapeseed Oil) | - | 1733 |
Carbon Disulfide | 1075 | - |
Carbon Tetrachloride | 958 | 1410 |
Diesel Fuel | - | 1545 |
Glycerin | 4510 | 4960 |
Kerosene | 1300 | 1440 |
Machine Oil | 1300 | 1510 |
Mercury | 24800 | 28600 |
Water, Fresh | 2180 | 2200 |
Water, Salt | 2340 | 2370 |
Further Reading
- Marks' Standard Handbook for Mechanical Engineers 11th Edition
- University Physics with Modern Physics (13th Edition)
- Bulk Modulus of Vegetable Oil-Diesel Fuel Blends. Varde
- Determining the Speed of Sound, Density, and Bulk Modulus of Rapeseed Oil, Biodiesel, And Diese Fuel. Nikolic et. al.
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