Mercury is used as a thermometric liquid for several reasons:

1. High Coefficient of Expansion: Mercury has a high coefficient of expansion which makes it very sensitive to temperature changes. This means that even a small change in temperature can cause a significant change in the volume of mercury, making it ideal for measuring temperature.

2. Uniform Expansion: Mercury expands uniformly with increase in temperature. This means that the space it occupies increases by the same amount for each degree rise in temperature. This property makes it easy to calibrate a mercury thermometer.

3. High Boiling Point: Mercury has a high boiling point (357°C). This means that a mercury thermometer can be used to measure high temperatures without the risk of the mercury evaporating.

4. Low Freezing Point: Mercury also has a low freezing point (-39°C). This means that a mercury thermometer can be used to measure low temperatures without the risk of the mercury freezing.

5. Inertness: Mercury does not react with the glass of a thermometer, which is important for maintaining the accuracy of the thermometer over time.

6. High Density and Visibility: Mercury is dense and highly visible, making it easy to read the temperature on a mercury thermometer.

7. It does not stick to the glass: Mercury is a liquid metal that does not wet or stick to the glass. This property ensures that it rises and falls freely in the capillary tube of the thermometer, providing accurate temperature readings.

Question

Mercury is used as a thermometric liquid for several reasons:

1. High Coefficient of Expansion: Mercury has a high coefficient of expansion which makes it very sensitive to temperature changes. This means that even a small change in temperature can cause a significant change in the volume of mercury, making it ideal for measuring temperature.

2. Uniform Expansion: Mercury expands uniformly with increase in temperature. This means that the space it occupies increases by the same amount for each degree rise in temperature. This property makes it easy to calibrate a mercury thermometer.

3. High Boiling Point: Mercury has a high boiling point (357°C). This means that a mercury thermometer can be used to measure high temperatures without the risk of the mercury evaporating.

4. Low Freezing Point: Mercury also has a low freezing point (-39°C). This means that a mercury thermometer can be used to measure low temperatures without the risk of the mercury freezing.

5. Inertness: Mercury does not react with the glass of a thermometer, which is important for maintaining the accuracy of the thermometer over time.

6. High Density and Visibility: Mercury is dense and highly visible, making it easy to read the temperature on a mercury thermometer.

7. It does not stick to the glass: Mercury is a liquid metal that does not wet or stick to the glass. This property ensures that it rises and falls freely in the capillary tube of the thermometer, providing accurate temperature readings.

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