Stopper (plug)


Stopper (plug)

A stopper is a truncated conical piece of rubber, cork, glass, or plastic used to close off a glass tube, piece of laboratory glassware, a wine bottle or barrel and other containers with orifices.

A rubber stopper is sometimes called a rubber bung, and a cork stopper is called a cork.

Ground glass stoppers and rubber stoppers are commonly used with laboratory glassware, mainly because of their nonreactivity. Some stoppers used in labs have holes in them to allow the insertion of glass or rubber tubing. This is often used when a reaction is taking place in the flask or test tube and the byproduct or result of the reaction is desired to be collected. For instance, if one were to boil water in a test tube in an attempt to collect the water vapor, one can seal the test tube with a stopper with holes in it. Upon inserting tubing into the hole(s) and exposing the tube to heat, the water vapor will rise through the hole, make its way through the tubing, and into the collection chamber of choice. The water vapor would not be able to escape into the air, because the stopper and the tubing, if set up correctly, should be airtight.


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Look at other dictionaries:

  • Stopper — The term stopper may refer to one of the following:*Stopper (knot), a type of a knot at the end of the rope. *Stopper (plug), also known as a cork, a plug or a bung used to temporarily seal a bottle opening. *Stopper (football magazine). *a… …   Wikipedia

  • plug — [n1] stopper bung, connection, cork, filling, fitting, occlusion, river, spigot, stopple, tampon, wedge; concepts 471,836 Ant. mouth, opening plug [n2] publicity advertisement, blurb*, good word*, hype*, mention, push*, write up; concept 274 plug …   New thesaurus

  • stopper — [stäp′ər] n. 1. a person or thing that stops or causes a stoppage 2. something inserted to close an opening; plug 3. Baseball a) a pitcher outstanding as a STARTER (i) who usually will stop a team s losing streak b) a CLOSER (sense 3) who is v …   English World dictionary

  • stopper — ► NOUN 1) a plug for sealing a hole. 2) a person or thing that stops something. ► VERB ▪ seal with a stopper …   English terms dictionary

  • stopper — (n.) glass plug for a bottle neck, 1660s, agent noun from STOP (Cf. stop) (v.) …   Etymology dictionary

  • plug — index clog, damper (stopper), obstruction, occlude, shut, stem (check), stop …   Law dictionary

  • plug — I (New American Roget s College Thesaurus) n. stopper, cork, dowel, plunger, tampon; quid, wad; wadding, padding, stopple, spigot. See closure. II (Roget s IV) n. 1. [An implement to stop an opening] Syn. cork, stopper, stopple, filling, stoppage …   English dictionary for students

  • plug — A removable cork or stopper which fills a hole. See blanking plug coil glow plug cold plug core hole plug core plugs drain plug drain plug key drain plug spanner drain plug wrench …   Dictionary of automotive terms

  • plug — I. noun Etymology: Dutch, from Middle Dutch plugge; akin to Middle High German pfloc plug Date: 1606 1. a. a piece used to fill a hole ; stopper b. an obtruding or obstructing mass of material resembling a stopper 2. a flat compressed cake of… …   New Collegiate Dictionary

  • plug — 1. noun 1) she pulled out the plug Syn: stopper, bung, cork, seal, spile 2) a plug of tobacco Syn: wad, quid, twist, chew, cake, stick 3) informal …   Thesaurus of popular words


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