Editing Funnel (section)

==Laboratory funnels==
{{main|Laboratory funnel}}
<!-- [[File:FilterFunnelApparatus.png|thumb|upright|A Büchner funnel with a sintered glass disc]] -->

There are many different kinds of funnels that have been adapted for specialised applications in the laboratory, such as [[filter funnel]]s and [[thistle funnel]]s (shaped like [[thistle]] flowers). [[Dropping funnel]]s have stopcocks which allow the fluids to be added to a flask slowly. For solids, a powder funnel with a wide and short stem is more appropriate as it does not clog easily.

When used with [[filter paper]], filter funnels, [[Büchner funnel|Büchner]] and [[Hirsch funnel]]s can be used to remove fine particles from a liquid in a process called [[filtration]]. For more demanding applications, the filter paper in the latter two may be replaced with a sintered glass frit. [[Separatory funnel]]s are used in [[liquid-liquid extraction]]s. The [[Tullgren funnel]] is used to collect [[arthropod]]s from [[plant litter]] or similar material.<ref name="dicent">{{cite book |title=A Dictionary of Entomology |year=2011 |publisher=CABI |isbn=978-1845935429 |page=172 |url=https://books.google.com/books?id=9IcmCeAjp6cC |access-date=9 July 2013}}</ref>

=== Construction ===
Glass is the material of choice for laboratory applications due to its inertness compared with metals or plastics. However, plastic funnels made of nonreactive [[polyethylene]] are used for transferring aqueous solutions. Plastic is most often used for powder funnels that do not come into contact with solvent in normal use.

=== Uses ===
* To channel [[liquids]] or fine-grained substances into containers with a small opening. Used for pouring liquids or powder through a small opening and for holding the filter paper in filtration. Used in transferring liquids in small containers.
* Funnels known as [[killing cone]]s are used to slaughter individual birds in [[poultry farming]]. The funnel is used to hold a bird upside down so that it can be bled more easily.<ref>Sparrey, J., SandercockD., Sparks, N., & Sandilands, V. (2014). Current and novel methods for killing poultry individually on-farm. ''World's Poultry Science Journal,'' ''70''(4), 737-758. doi:10.1017/S0043933914000816</ref>