The ability of the protective colloid is measured in terms of……………….

Answer

To solve the question regarding the ability of the protective colloid being measured in terms of a specific term, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protective Colloids**:
- Protective colloids are substances that stabilize colloidal systems and prevent coagulation. They play a crucial role in maintaining the stability of colloidal dispersions.

2. **Identifying the Measurement**:
- The ability of a protective colloid is quantified using a specific term that reflects its effectiveness in preventing coagulation.

3. **Defining Gold Number**:
- The term used to measure the protective power of a colloid is called the **Gold Number**.
- The Gold Number is defined as the amount of protective colloid (in milligrams) required to prevent the coagulation of 10 mL of a gold salt solution upon the addition of 1 mL of a 10% sodium chloride solution.

4. **Understanding Inverse Relationship**:
- The Gold Number is inversely proportional to the protective power of the colloid. This means that a lower Gold Number indicates a higher protective power.
- For example, if a colloid has a Gold Number of 0.005, it indicates that it is a very effective protective colloid.

5. **Conclusion**:
- Therefore, the ability of the protective colloid is measured in terms of the **Gold Number**.

### Final Answer:
The ability of the protective colloid is measured in terms of **Gold Number**.

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