The condition of free vapourisation throughout the liquid is called

Options

A. boiling
B. melting
C. both (1)and (2)
D. all of the above

Answer

To solve the question "The condition of free vaporization throughout the liquid is called," we need to analyze the options provided and understand the concepts involved.

### Step-by-Step Solution:

1. **Understanding Vaporization**:
- Vaporization is the process where a liquid turns into vapor (gas). This can occur in two ways: evaporation and boiling.

2. **Defining Free Vaporization**:
- Free vaporization refers to the process where vaporization occurs throughout the entire liquid, not just at the surface. This typically happens when the liquid reaches its boiling point.

3. **Identifying the Process**:
- When a liquid is heated to its boiling point, it undergoes boiling, which is characterized by the formation of bubbles within the liquid and vaporization occurring throughout the entire volume of the liquid.

4. **Analyzing the Options**:
- **Boiling**: This is the process that matches the description of free vaporization throughout the liquid.
- **Melting**: This refers to the transition from solid to liquid, which does not involve vaporization.
- **Both one and two**: This cannot be correct since only boiling pertains to vaporization.
- **All of the above**: This is also incorrect as melting does not relate to vaporization.

5. **Conclusion**:
- The correct answer is **boiling**, as it is the condition where free vaporization occurs throughout the liquid.

### Final Answer:
The condition of free vaporization throughout the liquid is called **boiling**.