The highest temperature at which vapour pressure of any liquid can be measured is

Options

A. Critical temperature
B. Boyle's temperature
C. Boiling point of the liquid
D. Kraft temperature

Answer

To solve the question regarding the highest temperature at which the vapor pressure of any liquid can be measured, we can follow these steps:

### Step 1: Understand Vapor Pressure
Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase. It increases with temperature.

**Hint:** Remember that vapor pressure is related to the tendency of molecules to escape from the liquid phase into the vapor phase.

### Step 2: Define Boiling Point
The boiling point of a liquid is defined as the temperature at which its vapor pressure equals the atmospheric pressure. At this point, the liquid can form vapor bubbles throughout the liquid.

**Hint:** The boiling point is a specific temperature where the vapor pressure reaches a certain level.

### Step 3: Consider the Critical Temperature
The critical temperature is the highest temperature at which a substance can exist as a liquid. Above this temperature, the liquid and vapor phases become indistinguishable.

**Hint:** Critical temperature is important but does not directly relate to the measurement of vapor pressure in the same way as boiling point.

### Step 4: Analyze the Options
1. **Critical Temperature**: This is not the highest temperature for measuring vapor pressure as it refers to the state where the liquid and vapor phases cannot coexist.
2. **Boils Temperature**: This seems to be a typographical error and likely refers to boiling point.
3. **Boiling Point of the Liquid**: This is the correct answer since it is the temperature at which vapor pressure equals atmospheric pressure.
4. **Craft Temperature**: This is not a standard term in thermodynamics related to vapor pressure.

**Hint:** Carefully evaluate the definitions of each term to identify the correct answer.

### Step 5: Conclusion
The highest temperature at which the vapor pressure of any liquid can be measured is its boiling point.

**Final Answer:** The correct option is **3. Boiling point of the liquid.**