Name: A1 เยลิ Star Motor the Selly (Evangelista Torricelli)
race: Italians
alive during the 2151: BC - 2190
what matters: create a barometer. For measuring the air pressure barometer
.The invention of the Torricelli is the greatest pressure meter or baron อมิเตอร์ (barometer) which arise from the problem solving experiment is important. The central Fountain Pond digging deep about 16-18 meters.Try pumping pipe in the high 12 meters or more by piston lift tide will occur while the vacuum caused strong lift the liquid up at the end of the pipe outlet, but discover that No matter how can go up only the limit 9-10 meters.When B.Prof.2186 (1643) Torricelli experiment more by mercury, which weighs a 13-14 folds of water, and found that, ผลทำนองเดียวกัน by limit below him build a pipeline with a length of about 1 meters filled with Mercury the end side of one ton.76 cm or 760 mm. Although the pipe will be given higher within the North mercury vacuum as (Torricellian vacuum) this is the source of the units compared the pressure of the air by air pressure at sea level is 760.The air pressure is less than 760 millimetre of mercury
.When the 2184 he announced this discovery that "the atmosphere is a cause of air pressure change at different times." ""
.And this is the pressure meter machine first discovery reputation forever to him. For many centuries later, the unit name to measure pressure. It was named after his surname that Thor (Torr), which is the unit mmHg.By comparison 1 mmHg or 1 Thor, equivalent to about 133.322 Pascal in derived units of international system of units (SI)
.He was later found that the pressure or air pressure in these each day will be different changes to the current understanding เล็กน้อยนอกจากนี้ height of liquid in the pipe indirectly. Air pressure (which change each elevation).The movement of fluid
rules of Torricelli (Torricelli 'sLaw) on the speed of the fluid flow from the tube opening. After receiving the expanding and understand a principle of Bernoulli (Bernoulli 's principle)
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