A funnel is a pipe through a broad (often conical) mouth and a narrow stem. It is used to channel fluid or fine-grained substances right into containers v a little opening. There is no a funnel, spillage might occur.

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Funnels are usually made of stainless steel, aluminium, glass, or plastic. The material used in its construction should be sturdy sufficient to withstand the load of the substance being transferred, and also it need to not react with the substance. For this reason, stainless stole or glass are beneficial in carrying diesel, if plastic funnels are useful in the kitchen. Sometimes disposable file funnels are supplied in situations where it would certainly be daunting to adequately clean the funnel afterwards (for example, in including motor oil come a car). Dropper funnels, also called dropping funnels or insanity funnels, have a madness to allow the managed release the a liquid. A flat funnel, make of polypropylene, utilizes living hinges and flexible wall surfaces to fold flat.

The term "funnel" may refer come the chimney or smokestack top top a steam locomotive and commonly refers to the exact same on a ship. The hatchet funnel is also applied to other seemingly weird objects favor a smoking cigarettes pipe or a kitchen bin.


Laboratory funnels

There are many different kinds of funnels that have been adapted for dedicated applications in the laboratory. Filter funnels, thistle funnels (shaped favor thistle flowers), and also dropping funnels have actually stopcocks which allow the fluids to be included to a flask slowly. Because that solids, a flour funnel through a vast and short stem is much more appropriate together it does not clog easily.


When used with filter paper, filter funnels, Büchner and also Hirsch funnels have the right to be offered to remove fine corpuscle from a fluid in a procedure called filtration. For more demanding applications, the filter record in the latter two might be changed with a sintered glass frit. Separatory funnels are used in liquid-liquid extractions. The Tullgren funnel is supplied to collect arthropods from tree litter or similar material.

Construction

Glass is the product of selection for activities applications due to its inertness contrasted with steels or plastics. However, plastic funnels do of nonreactive polyethylene are supplied for moving aqueous solutions. Plastic is most regularly used because that powder funnels that carry out not come into call with solvent in common use.

Uses

Culture


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In renowned culture, the believe Woodman in L. Frank Baum"s novel The wonderful Wizard that Oz (and in most dramatizations that it) supplies an inverted funnel for a hat, though that is never specifically discussed in the story—it source in W. W. Denslow"s original illustrations for the book.

In the computer world, a funnel is typically used as the icon for the filter functionality.

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