Article | REF: BM6201 V1

Designing water fluid circuits

Author: Olivier COSTE

Publication date: January 10, 2010

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2. Hydraulics

2.1 Some physical quantities useful in hydraulics

  • Density: the ratio between a mass m (in kg) of homogeneous matter and the volume V (in m 3 ) occupied by this mass in kg · m –3 : ρ = m/V. Its inverse, called mass volume, is sometimes used. It can be seen that the densities of liquids are around 1,000 times higher than those of gases (liquids are in a more condensed form than gases). When a fluid maintains a constant density, it is said to be in incompressible flow. Otherwise, the flow is said to be compressible. Liquids can largely be considered to be incompressible.

  • Density: this is the ratio between the mass of a certain volume of a...

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