The height of mercury column of a barometer at the sea level is

Options

A. 76 m
B. 76 cm
C. 1 m
D. `0.76 ` mm

Explanation

To find the height of the mercury column in a barometer at sea level, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Atmospheric Pressure**:
- At sea level, the atmospheric pressure is defined as 1 atmosphere (1 atm).

2. **Convert Atmospheric Pressure to Mercury Column Height**:
- It is known that 1 atm is equivalent to a height of 760 mm of mercury (mmHg). This means that the pressure exerted by the atmosphere can support a column of mercury that is 760 mm high.

3. **Express the Height in Different Units**:
- To express the height in centimeters, we can convert millimeters to centimeters. Since there are 10 millimeters in a centimeter:
\[ 760 \, \text{mmHg} = \frac{760}{10} \, \text{cmHg} = 76 \, \text{cmHg} \]

4. **Conclusion**:
- Therefore, the height of the mercury column in a barometer at sea level is 76 cmHg.

### Final Answer:
The height of the mercury column of a barometer at sea level is **76 cmHg**.

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