a: Mercury barometer ~
b: the water-in-a-trough experiment
What: "A mercury barometer is like the water-in-a-trough experiment - a tube of mercury standing in a reservoir, which is enclosed to avoid escape of poisonous mercury vapour. A small hole allows the changing atmospheric pressure to contact the mercury surface "
Writer: Chris Fawkes, BBC Weather forecaster
Date: Feb 6 2014 3:48 PM
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