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This vacuum state is called high vacuum, and the study of fluid flows in this regime is called particle gas dynamics. The MFP of air at atmospheric pressure is very short, 70 nm , but at 100 mPa (≈ 10 −3 Torr ) the MFP of room temperature air is roughly 100 mm, which is on the order of everyday objects such as vacuum tubes .
The predecessor to the vacuum pump was the suction pump. Dual-action suction pumps were found in the city of Pompeii. [2] Arabic engineer Al-Jazari later described dual-action suction pumps as part of water-raising machines in the 13th century.
Ultra compact cylinder model, the DC26, known as the Dyson "City" is the World's smallest vacuum with constant suction. Even smaller than the DC22. The machine is so small that it will fit onto a piece of A4 paper.
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Typically, vacuum excavation loosens the soil with a blunt-nosed high-pressure air lance or water source and vacuums away loosened material. A suction excavator with vacuum excavation equipment operating in the Netherlands. Depending on the machine used and soil conditions, a 12-inch-square, 5-foot-deep pothole can be completed in 20 minutes or ...
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