Difference betwem simple mercury and Fortin's barometer
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A mercury barometer is a tube closed at the top, containing mercury with a "Toricellian vacuum" above it, and a mercury bath at the open bottom end. The pressure on the open bath determines the height of the mercury column above it. There is a scale to read the air pressure relative to the vacuum.
An aneroid barometer is a closed, flexible container of gas. Attached to this container is a mechanism to move a pointer on a scale. When atmospheric pressure changes, the container changes internal volume, moving the scale pointer to indicate the pressure outside of it relative to the fixed pressure inside it.
An aneroid barometer is a closed, flexible container of gas. Attached to this container is a mechanism to move a pointer on a scale. When atmospheric pressure changes, the container changes internal volume, moving the scale pointer to indicate the pressure outside of it relative to the fixed pressure inside it.
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