![]() He is credited with giving the first modern explanation of atmospheric pressure. Torricelli attracted considerable attention when he demonstrated the first mercury barometer to the general public. Although frequently encountered, the alternative spelling "Tor" is incorrect. The torr is sometimes incorrectly denoted by the symbol "T", which is the SI symbol for the tesla, the unit measuring the strength of a magnetic field. The symbol (uppercase) should be used with prefix symbols (thus, mTorr and millitorr are correct, but mtorr and milliTorr are not). ![]() The unit name torr is written in lower case, while its symbol ("Torr") is always written with upper-case initial including in combinations with prefixes and other unit symbols, as in "mTorr" (millitorr) or "Torrâ‹…L/s" (torr-litres per second). ![]()
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