Why do we measure blood pressure in millimeters of mercury?
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D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000266:history*; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D007394:International System of Units / Q000266:history*; D008628:Mercury / Q000266:history*
D008628:Mercury