Question

Give an example of a fluid in the real world that would need to be viscous. Explain Why?

Answer 1

Blood. If it were not viscous, it would accumulate away from our brain and we would die.

Answer 2

motor oil, it has to be viscous to hang to the metallic surfaces and offer its slippery properties.
Silicon oil, used to damp the revolution of gears (as a clutch would).

Answer 3

thank you