NationMaster - Encyclopedia: Aspirator

An aspirator, also called an ejector, is a device that produces vacuum by means of the Venturi effect. In an aspirator, fluid (liquid or gaseous) flows through a tube which then narrows. When the tube narrows, the fluid's speed increases, and because of the Venturi effect, its pressure decreases. Vacuum is taken from this point. Image File history File links Download high resolution version (848x2140, 775 KB)Copper aspirator This image has been released into the public domain by the copyright holder. ... Image File history File links Download high resolution version (848x2140, 775 KB)Copper aspirator This image has been released into the public domain by the copyright holder. ... The Venturi effect is a special case of Bernoullis principle, in the case of fluid or air flow through a tube or pipe with a constriction in it. ...

The cheap and simple water aspirator is the most common type of aspirator. It is used in chemistry and biology laboratories and consists of a tee fitting which is attached to a faucet and has a hose barb at one side. The flow of water passes through the straight portion of the tee, which has a restriction at the intersection, where the hose barb is attached. The vacuum hose should be connected to this barb. Multicolored chemicals are frequent hallmarks of chemistry. ... Biology is the branch of science dealing with the study of life. ... This article is in need of attention. ... A tee is a stand used to support a stationary ball so that the player can strike it, particuarly in golf, Tee Ball, American football, and rugby. ... Categories: Stub ...

If a liquid is used as the working fluid, the strength of the vacuum produced is limited by the vapor pressure of the liquid (for water, 24 mmHg at 25 degrees Celsius.) If a gas is used, however, this restriction does not exist; a multi-stage steam ejector can reach pressures as low as 0.005 mmHg.^[1] Look up Vacuum in Wiktionary, the free dictionary For other uses, see vacuum (disambiguation) A vacuum is a volume of space that is empty of matter, including air, so that gaseous pressure is much less than standard atmospheric pressure. ... Vapor pressure is the pressure of a vapor in equilibrium with its non-vapor phases. ... One way of defining pressure is in terms of the height of a column of fluid that may be supported by that pressure; or the height of a column of fluid that exerts that pressure at its base. ... A degree Celsius (Â°C) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701-1744), who first proposed a similar system in 1742. ... One way of defining pressure is in terms of the height of a column of fluid that may be supported by that pressure; or the height of a column of fluid that exerts that pressure at its base. ...

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Categories: Science stubs | Laboratory equipment Laboratory equipment refers to the various tools and equipment used by scientists working in a laboratory. ... A bunsen burner with needle valve. ... A calorimeter is a device used for calorimetry, the science of measuring the heat of chemical reactions or physical changes. ... A colorimeter is generally any tool that characterizes colour samples to provide an objective measure of colour characteristics. ... A laboratory centrifuge tabletop centrifuge A centrifuge is a piece of equipment that puts a substance in rotation around a fixed axis in order for the centrifugal force to separate a fluid from a fluid or from a solid substance. ... A common modern fume hood. ... 1852 microscope Compound microscope made by John Cuff in 1750 A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye. ... A Microtiter plate or microplate is a flat plate with multiple wells used as small test tubes. ... Plate readers are laboratory instruments designed to detect biological, chemical or physical events in samples stored in microtiter plates. ... In physics, spectrophotometry is the quantitative study of spectra. ... A thermometer is a device which measures temperature or temperature gradient, using a variety of different principles. ... A Vortex Mixer is a simple device used most commonly in cell culture and microbiology laboratories to suspend cells, although it can be used to mix many other substances. ... Three static mixers: The top is an alternating spiral with each spiral offset by 90Â°; the second is the above in a delivery tube, such as for epoxy; the last is a larger metal mixer used to divide a flow into streams that intersect at 90Â°. A static mixer is... Brown glass jars with some clear lab glassware in the background Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratories. ... A large, thick-walled laboratory tube used for strongly heating substances with a Bunsen burner or other heat source. ... A BÃ¼chner funnel connected to a flask with a tube leading to a vacuum pump BÃ¼chner funnel is a piece of laboratory equipment used in filtration. ... A closeup of a burette showing the stopcock A burette (also buret) is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap, or stopcock, on the bottom. ... A conical measure is a type of laboratory glassware which consists of a conical cup with a notch on the top to allow for the easy pouring of liquids. ... For other uses of crucible, see Crucible (disambiguation) Crucibles used in Czochralski method A crucible is a cup-shaped piece of laboratory equipment used to contain chemical compounds when heating them to very high temperatures. ... A cuvette is a kind of laboratory glassware, usually a small square tube, sealed at one end, made of plastic, glass, or optical grade quartz and designed to hold samples for spectroscopic experiments. ... Erlenmeyer flasks from the Argonne National Laboratory glassblowing shop. ... Erlenmeyer flasks from the Argonne National Laboratory glassblowing shop. ... Florence flask A Florence flask (also known as a round bottom flask or a boiling flask) is a piece of laboratory glassware. ... A volumetric flask (vol flask for short) is a piece of laboratory glassware used to measure a very precise and accurate amount of a liquid, and is used for such when the amount is too big for a pipette or burette. ... A BÃ¼chner funnel connected to a flask with a tube leading to a vacuum pump A BÃ¼chner flask, also known as a vacuum flask, is a thick-walled erlenmeyer flask with a glass tube and hose barb protruding about an inch from its neck, connected to an aspirator. ... A gas syringe is a piece of laboratory glassware used to draw a volume of a gas from a beaker or other closed system, or measure the volume of gas given off in a reaction. ... Illustration of a graduated cylinder The circular plastic ring is used to prevent breakage of the lip of the cylinder if it is accidentally knocked over. ... A pipette is a laboratory instrument used to transport a measured volume of liquid. ... Man looking at fungus inside of petri dishes A Petri dish is a shallow glass or plastic cylindrical dish that biologists use to culture microbes. ... Separating funnel A separating funnel or separation funnel or separatory funnel is a piece of equipment used in science to separate two immiscible liquids or solutions of different densities. ... A schematic representation of a Soxhlet extractor A Soxhlet extractor is a type of laboratory glassware invented in 1879 by Franz von Soxhlet. ... A test tube (Sometimes culture tube) is a kind of laboratory glassware, composed of a fingerlike length of glass tubing, open at the top, sometimes with a rounded lip at the top, and a rounded U shaped bottom. ... A thistle tube is a piece of laboratory glassware consisting mostly of a shaft of tube, with a reservoir and funnel-like section at the top. ... Caesium fluoride sample on a watch glass A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. ...

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