What is a fluid? Give some examples of different fluids.

a substance that has no fixed shape and yields easily to external pressure; a gas or a liquid. Water is an example.

Answer with explanation:

Any substance which flows or changes its shape under an applied shear stress is called as a fluid.

Fluids can be categorized into five main different types which are as follows:

1. Real fluid,

2. Ideal fluid,

3. Ideal plastic fluid,

4. Newtonian fluid; and

5. Non-Newtonian fluid.

While some examples of fluids include:

Air, water, oil, river flowing down a mountain, blood moving through a circulatory system.