Name: a-one ye Li STA REE-Astor (Evangelista Torricelli) Lee.Nationality: ItalianLive: 2151-2190 BC.Important works: create a barometer to measure air pressure.Barometer The ingenuity point of service to big league is the biggest air pressure gauge or Barometer (barometer), which arose from solving an important trial. The pond digging deep to create namphuklang about 16-18 meters of Grand Duke of that code, whilst trying to pump the water in the pipes, more than 12 meters tall, or by water while lifting cylinder vacuum will cause the liquid pressure lifting up at the end of an outgoing pipe, but found that no matter what, it's up to the maximum limit of 9-10 mail.Smoking, no higher than the SQM this. In 2186 (1643) trial service to big league more by using a thermometer, which is 13-14 as heavy water and found similarly by effective lower limit, he created the pipe is about 1 metre long container filled with mercury at the end of side a ton and then install vertical, above the other end submerged in the bath thermometer in suite.Raised to the pipe is athuk height 76 cm or 760 millimeters, only approximately, although the pipe, the higher the vacuum above the mercury is the. This is the way (the Torricellian vacuum) of the unit against the pressure of the air by the air pressure at sea level is equal to 760 mm of mercury and the altitude over sea level. Air pressure, 760 millimeters of mercury is less than.In 2184 This discovery, he declared that "the atmosphere is the cause of the air pressure changes in a different time."And this is the air pressure gauge. The first is the discovery of the famous forever unto him. Many centuries later. The name of the unit in which the measured pressure is set according to the surnames of him, Thor (torr), which is the unit of 1 millimetre mm Mercury thermometer or renders 1 Tor is equal to 133.322 Paschal II in the estimation of the derivative unit unit.He later found that the experimental pressure or air pressure in each day is a little different, changing current also understand very well that the height of the liquid in the pipe, the air pressure fluctuations on variables (which vary per elevation).The movement of the fluidPerfect big league rules (Torricelli'sLaw) on the speed of the fluid flowing out of the pipe opening and later extended receiving and understanding become the bear League (Bernoulli principle), nun.
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