流体性质
基本性质 | Properties
密度 | Density
Mass density ρ is defined as the mass of the substance per unit volume
Units: kilograms per cubic metre (kg m−3)
Basic dimensions
[M] for mass, [L] for length, [T] for time
Weight
W = mg
Units: newtons (N), kg m /s2
Specific Weight
w = ρg
Units: (N / m−3)
Typical values:
- water, 9.81 × 10 3 N / m−3
- air, 12.07 N / m−3
可压缩性 | Compressible
A liquid is difficult to compress and, for many purposes regarded as incompressible.
A gas is easy to compress.