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Cupping therapy is a form of pseudoscience in which a local suction is created on the skin using heated cups. As alternative medicine it is practiced primarily in Asia but also in Eastern Europe, the Middle East , and Latin America .
A suction cup, also known as a sucker, is a device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum. [ 1 ] Suction cups occur in nature on the bodies of some animals such as octopuses and squid , and have been reproduced artificially for numerous purposes.
A Büchner flask, also known as a vacuum flask, [1] filter flask, suction flask, side-arm flask, or Bunsen flask, is a thick-walled Erlenmeyer flask with a short glass tube and hose barb protruding about an inch from its neck.
The liquid to be filtered is poured into the cylinder and drawn through the perforated plate/fritted glass disc by vacuum suction. The main advantage in using this type of filtration is that it proceeds much more quickly (several orders of magnitude) than simply allowing the liquid to drain through the filter medium via the force of gravity.
Diagram of the vacuum filtration apparatus. By flowing through the aspirator, water will suck out the air contained in the vacuum flask and the Büchner flask.There is therefore a difference in pressure between the exterior and the interior of the flasks : the contents of the Büchner funnel are sucked towards the vacuum flask.
Filter flask (suction flask, with sintered glass filter containing sample). Note the almost colourless filtrate in the receiver flask. Many filtration processes include more than one filtration mechanism, and particulates are often removed from the fluid first to prevent clogging of downstream elements. Particulate filtration includes: