Answer:
To make a barometer compact, the height of the tube which holds the liquid column, should be less. For this, we need a high density liquid. The best suited liquid for this is mercury (Hg) with a high density of 13.6 g/cc. Further, due to its high surface tension, it is non sticky to glass. And is easily viewed through glass because of its shine. Besides, mercury has a high boiling point.
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