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The invention of the mercury barometer is generally credited to Evangelista Torricelli in 1643.
It is used to measure atmospheric pressure. The barometer works by utilizing the weight of the atmosphere pushing down on a column of mercury in a sealed tube. Higher atmospheric pressure pushes the mercury higher in the tube, while lower pressure allows it to fall. By observing the height of the mercury column, you can gauge the changes in atmospheric pressure.

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The invention of the mercury barometer is generally credited to Evangelista Torricelli in 1643.
It is used to measure atmospheric pressure. The barometer works by utilizing the weight of the atmosphere pushing down on a column of mercury in a sealed tube. Higher atmospheric pressure pushes the mercury higher in the tube, while lower pressure allows it to fall. By observing the height of the mercury column, you can gauge the changes in atmospheric pressure.