types of funnel and their uses?
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funnel is a pipe with a wide (often conical) mouth and a narrow stem. It is used to channel liquid or fine-grained substances into containers with a small opening. Without a funnel, spillage may occur.
Funnels are usually made of stainless steel, aluminium, glass, or plastic. The material used in its construction should be sturdy enough to withstand the weight of the substance being transferred, and it should not react with the substance. For this reason, stainless steel or glass are useful in transferring diesel, while plastic funnels are useful in the kitchen. Sometimes disposable paper funnels are used in cases where it would be difficult to adequately clean the funnel afterwards (for example, in adding motor oil to a car). Dropper funnels, also called dropping funnels or tap funnels, have a tap to allow the controlled release of a liquid. A flat funnel,[1] made of polypropylene, utilizes living hinges and flexible walls to fold flat.
The term "funnel" may refer to the chimney or smokestack on a steam locomotive and commonly refers to the same on a ship. The term funnel is also applied to other seemingly strange objects like a smoking pipe or a kitchen bin.
Funnels are usually made of stainless steel, aluminium, glass, or plastic. The material used in its construction should be sturdy enough to withstand the weight of the substance being transferred, and it should not react with the substance. For this reason, stainless steel or glass are useful in transferring diesel, while plastic funnels are useful in the kitchen. Sometimes disposable paper funnels are used in cases where it would be difficult to adequately clean the funnel afterwards (for example, in adding motor oil to a car). Dropper funnels, also called dropping funnels or tap funnels, have a tap to allow the controlled release of a liquid. A flat funnel,[1] made of polypropylene, utilizes living hinges and flexible walls to fold flat.
The term "funnel" may refer to the chimney or smokestack on a steam locomotive and commonly refers to the same on a ship. The term funnel is also applied to other seemingly strange objects like a smoking pipe or a kitchen bin.
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Standard
Standard plastic and metal funnels come in a variety of sizes useful for any task that requires pouring liquids or powders into containers with small openings. A common variation on the kitchen funnel is one with a wide, round opening that narrows to a smaller opening rather than a stem. These are often used in canning for transferring cooked food from a canning pot into wide-mouthed jars suitable for storage.
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Buchner
Buchner (BYOOCK-ner) funnels are one of three types of filtering funnels produced specifically for use in laboratories. They are available in white, glazed porcelain or lightweight polypropylene. Both types have large bowls dotted with holes (similar to a sieve) on the surface of a flat bottom over the stem. A rubber stopper with a stem-sized hole in it can be used to fit the funnel snugly into the opening of another container. (See References 1)
Stemmed and Stemless
Stemmed and stemless filtering funnels are made of laboratory glass and resemble standard kitchen funnels. They are constructed from borosilicate glass made to withstand “thermal shock and chemical attack better than most other kinds," according to the Indigo Instruments website. Stemmed funnels are shaped similar to a standard kitchen funnel and are used for gravity filtration. Stemless funnels are designed for hot filtrations, but can also be used for gravity filtration. (See References 1, 3, 5)
Separatory
Separatory funnels are shaped like a bulb that gradually reduces down to a long, slender stem. They accept both rubber and ground glass stoppers at the opening, and have a glass or Teflon stopcock where the bulb meets the stem. Separatory funnels require the support of a ring stand. A stemmed glass filtering funnel is placed in the top of the separatory funnel to fill it. Then a test tube or other laboratory container can be placed under the stem of the separatory funnel to dispense precise amounts of liquid using the stopcock.
Standard plastic and metal funnels come in a variety of sizes useful for any task that requires pouring liquids or powders into containers with small openings. A common variation on the kitchen funnel is one with a wide, round opening that narrows to a smaller opening rather than a stem. These are often used in canning for transferring cooked food from a canning pot into wide-mouthed jars suitable for storage.
You May Like:
Different Kinds of Flasks
Buchner
Buchner (BYOOCK-ner) funnels are one of three types of filtering funnels produced specifically for use in laboratories. They are available in white, glazed porcelain or lightweight polypropylene. Both types have large bowls dotted with holes (similar to a sieve) on the surface of a flat bottom over the stem. A rubber stopper with a stem-sized hole in it can be used to fit the funnel snugly into the opening of another container. (See References 1)
Stemmed and Stemless
Stemmed and stemless filtering funnels are made of laboratory glass and resemble standard kitchen funnels. They are constructed from borosilicate glass made to withstand “thermal shock and chemical attack better than most other kinds," according to the Indigo Instruments website. Stemmed funnels are shaped similar to a standard kitchen funnel and are used for gravity filtration. Stemless funnels are designed for hot filtrations, but can also be used for gravity filtration. (See References 1, 3, 5)
Separatory
Separatory funnels are shaped like a bulb that gradually reduces down to a long, slender stem. They accept both rubber and ground glass stoppers at the opening, and have a glass or Teflon stopcock where the bulb meets the stem. Separatory funnels require the support of a ring stand. A stemmed glass filtering funnel is placed in the top of the separatory funnel to fill it. Then a test tube or other laboratory container can be placed under the stem of the separatory funnel to dispense precise amounts of liquid using the stopcock.
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