What is the difference between a liquid and a fluid.
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All liquids are fluids, but not all fluids are liquids.
A fluid is a substance which has a viscosity and flows under shear stress or an external force.
A liquid is a nearly incompressible fluid that conforms to it’s container and has nearly constant volume(unlike a gas, another fluid)
Liquids: a state of matter that flows and has a constant volume
Fluids: a catch all term that encompasses anything that flows. Typically, liquids, gases and plasmas.
Rule of thumb: fluids take the shape of their container; liquids take the shape of their container but don’t necessarily expand to fill the whole thing. (Gasses take the shape of their container and *do* expand to fill the whole thing, ignoring effects of gravity.)
A liquid has to be a wet substance. A fluid is anything that flows, and that includes air, smoke, traffic etc etc.
Fluids are liquids and gasses. To put it simply, it’s anything that flows.
All liquids are fluids. Not all fluids are liquids. Water is a liquid and a fluid. Air is a fluid, but not a liquid.
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