The internal resistance to flow in liquid is called

Options

A. Fluidity
B. Specific resistance
C. Viscosity
D. Surface tension

Answer

To solve the question "The internal resistance to flow in liquid is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for the term that describes the internal resistance to flow in liquids. This is a fundamental concept in the study of fluid dynamics.

2. **Identifying Key Terms**: The key term here is "internal resistance to flow." This suggests that we are looking for a property of liquids that affects how they move or flow.

3. **Reviewing Options**: Although the options are not provided in the question, we can infer that common terms related to fluid flow might include:
- Viscosity
- Density
- Surface tension
- Cohesion

4. **Defining Viscosity**: Viscosity is defined as the measure of a fluid's resistance to flow. It describes how thick or sticky a liquid is, which directly relates to how easily it can flow.

5. **Conclusion**: Based on the definition and understanding of the terms, we can conclude that the internal resistance to flow in a liquid is called **viscosity**.

### Final Answer:
The internal resistance to flow in liquid is called **viscosity**.

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