student asking question

What is the difference between "fluid" and "liquid"?

teacher

Native speaker’s answer

Rebecca

A "liquid" is a substance that isn't a solid or gas that pours easily and can form in the shape of a container. "Fluids" are substances that flow easily and have some thickness. Keep in mind that sometimes liquids and fluids are used interchangeably. It really depends on what you're talking about. Ex: Make sure to drink plenty of fluids/liquids when it's hot out. (interchangeable) Ex: Her car needs more brake fluid. (we don't use liquid here usually) Ex: Mercury is a liquid metal. (we don't use fluid here usually)

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