27. a fluid's resistance to flow is called a. temperature b. density c. viscosity d. mass e. heat

C. Viscosity.

Explanation:

Viscosity refers to the resistance of a fluid to move. A fluid that has low viscosity can move easily. A fluid with large viscosity resists to the movement. For example, water has low viscosity and if you pour it into a glass, it will be done quickly. But if you try to pour honey, it will take more time because it has a large viscosity.

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