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because it is the only metal which is liquid at room temperature and non metal cannot be used.That's why.
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Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. ... This is because mercury is 13.6 times more dense than water. ... Because if you used water the barometer tube would have to be over 30 feet long.
also because of its silver colour and the tendency of being non-stick.
True, because CO2 has capability to absorb IR radiations and are heated and thus gets lifted up. Vibrational energy of C=O bonds lies in IR while this doesn't happens in N2 and O2.
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