Question

why is mercury used as thermometric liquid? Mention its tow advantages.​

Answer 1

Explanation:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures

Answer 2

Advantages of using Mercury as a barometric liquid are:-

1. The density of Mercury (=13.6 × 10³ kg/m³) is greater than that of any other liquid, so only 0.76 m height of Mercury column is needed to balance the normal atmospheric pressure. Use of other liquids require much longer tube.
2. The vapour pressure of mercury is negligible so the vapours in the torricellian vacuum does not affect the barometric height.

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