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In automobile racing, particularly United States Auto Club and Champ Car Indy car racing, inches of mercury was the unit used to measure turbocharger inlet pressure. However, the inch of mercury is still used today in car performance modification to measure the amount of vacuum or pressure within the engine's intake manifold.
In vacuum systems, the units torr (millimeter of mercury), micron (micrometer of mercury), [8] and inch of mercury are most commonly used. Torr and micron usually indicates an absolute pressure, while inHg usually indicates a gauge pressure.
A mercury vacuum is a vacuum cleaner specifically designed to collect mercury (the metallic element, not the planet), for instance to clean up spills of the element. It is a requirement of the U.S. EPA that a mercury vacuum cleaner be used to clean up mercury spills (if an alternative method is used, a description of the method must be submitted to the EPA Administrator in a Notification of ...
The mercury at the top of the capillary breaks and a vacuum forms there. The pressure is then measured in the usual way by the difference between the heights of the right and centre columns. [11] Since a new vacuum is formed each time a measurement is made, there is no problem with the vacuum becoming contaminated.
Though a maximum vacuum one can theoretically achieve at sea level is 29.921 inches of mercury (Hg,) this will vary significantly as altitude increases. For example, in Denver, Colorado, at one mile (1.6 km) above sea level, it is only possible to achieve a vacuum on the mercury scale of 24.896 Hg.
When millimetres of mercury (or inches of mercury) are quoted today, these units are not based on a physical column of mercury; rather, they have been given precise definitions that can be expressed in terms of SI units. [7] One millimetre of mercury is approximately equal to one torr. The water-based units still depend on the density of water ...
Atmosphere of Mercury, ... Vacuum expected in the beam pipe of the Large Hadron Collider's ATLAS experiment [9] (operates at a pressure of 1 nPa to 10 nPa) [10]
By 1709, Francis Hauksbee improved on the design further with his two-cylinder pump, where two pistons worked via a rack-and-pinion design that reportedly "gave a vacuum within about one inch of mercury of perfect." [10] This design remained popular and only slightly changed until well into the nineteenth century. [10]