State two advantages of use of mercury as a barometric liquid.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Context**: A barometer is an instrument used to measure atmospheric pressure. The liquid used in a barometer plays a crucial role in its functionality.

2. **Advantage 1 - High Density**: One of the primary advantages of using mercury in a barometer is its high density. Mercury has a density of approximately 13.6 g/cm³, which is significantly greater than that of other liquids. This high density means that a shorter column of mercury (about 0.76 meters) can balance the atmospheric pressure, making the barometer more compact and easier to use.

3. **Advantage 2 - Non-wetting Properties**: Another advantage of mercury is that it does not wet the glass. This means that mercury does not adhere to the sides of the glass tube, allowing for a clear and defined meniscus. This property enhances the accuracy of the readings taken from the barometer, as it prevents any errors that could arise from liquid sticking to the sides of the tube.

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