Answers

2014-12-09T18:53:56+05:30
Mercury has a good linear expansion on temp scale[i.e the same amount of expansion per degree],whereas lot of other liquids have exponential expansion curves over large scales[i.e differing amount of expansion per degree change].this means it is easier to have an equal scale with mercury rather than other liquids where the scale have to be non-linear
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2014-12-09T18:54:23+05:30
Because it is highly expandable  it s opaque and shining
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