What is mercury barometer?

or:What is mercury barometer?or:If you put a liquid in a tube sealed at one end with a low pressure at the end of the tube and a pool of liquid at th

or:What is mercury barometer?

or:If you put a liquid in a tube sealed at one end with a low pressure at the end of the tube and a pool of liquid at the other end, air pressure will push the liquid further up inside the tube. When the air pressure is low, the liquid falls down the tube. If you mark the tube like you'd mark a thermometer, you can use it to measure the air pressure.One of the measures of air pressure is mmHg (meaning millimetres of Mercury).

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