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A glass McLeod gauge, drained of mercury. A McLeod gauge is a scientific instrument used to measure very low pressures, down to 10 −6 Torr (0.133 mPa).It was invented in 1874 by Herbert McLeod (1841–1923). [1]
The parent of all mercury pressure gauges is the mercury barometer invented by Evangelista Torricelli in 1643. [15] An early engineering application of the mercury pressure gauge was to measure pressure in steam boilers during the age of steam. The first use on steam engines was by James Watt while developing the Watt steam engine between 1763 ...
Using atmospheric pressure as reference is usually signified by a "g" for gauge after the pressure unit, e.g. 70 psig, which means that the pressure measured is the total pressure minus atmospheric pressure. There are two types of gauge reference pressure: vented gauge (vg) and sealed gauge (sg).
Two years later a third factory was opened in Amlwch, Anglesey. Budenberg Gauge remained a family-owned company from its inception in 1850 until 1991 when it was sold to Burnfield plc. In 2002 the company vacated its historic Broadheath factory and moved to Irlam, where it continued to manufacture pressure gauges and accessories until 2020. In ...
A centimetre of water [1] is a unit of pressure. It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity, so that 1 cmH 2 O (4°C) = 999.9720 kg/m 3 × 9.80665 m/s 2 × 1 cm = 98.063754138 Pa ≈ 98.0638 Pa, but conventionally a nominal maximum water density of 1000 kg/m 3 is used, giving ...
Officials at Wildlife World Zoo in Arizona reported two big cats and three large birds died, while 25 human employees were also exposed to the bird flu.
After analyzing hours of footage, police determined that he was not a threat. He was often smiling, and Kobayashi had an opportunity to cry out for help as they walked past LAPD officers.
The experiment uses a simple barometer to measure the pressure of air, filling it with mercury up until 75% of the tube. Any air bubbles in the tube must be removed by inverting several times. After that, a clean mercury is filled once again until the tube is completely full. The barometer is then placed inverted on the dish full of mercury.