What exactly is a fluid? It helps to know the characteristics!
- Fluids are a state of matter in which a substance cannot hold a shape.
- Fluids can be a liquid, a gas, or air.
- Newtonian fluids flow easily and continually under an applied stress.
- Liquids are said to flow in a continuum.
- Some fluids, such as air and gas, are said to be compressible.
Some fluids are Newtonian. These fluids have a:
- linear relationship between the shear stress and the shear rate.
- definable coefficient of viscosity.
- constant coefficient of viscosity.
- predictable behavior.
Some fluids are Non-Newtonian. These fluids:
- do not behave like Newtonian fluids.
- are subject to shear stress from other factors such as temperature and pressure.
- a coefficient of viscosity that is not possible to calculate.
- have unpredictable behavior.
Want to know more? Take a look at the post on Terms. Also, read the posts on Newtonian Fluids, Non-Newtonian Fluids, viscosity, coefficient of viscosity, shear stress, and shear rate. And – don’t forget to check out the Non-Newtonian Fun post!
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