609 B
609 B
Hydrostatic equilibrium and fluid motion.
Fluids include gasses and liquids.
- For a gas, the density changes readily, and the molecules are far apart.
- For liquids, molecules are close together, and the density remains basically constant
A fluid is defined as a matter that flows under the influence of external forces.
Fluids cannot maintain a fixed structure, but fit the shape of the container they're confined to.
Pressure
Pressure is defined as force per unit area* exerted by a fluid.
p = \frac{F (N)}{A(m^2)}
The SI unit for pressure is called a pascal, and it's \frac{N}{m^2}.