Butter

Solid and melted butter

Butter is a dairy product made from the fat and protein components of churned cream. It is a semi-solid emulsion at room temperature, consisting of approximately 80% butterfat. It is used at room temperature as a spread, melted as a condiment, and used as a fat in baking, sauce-making, pan frying, and other cooking procedures.

Most frequently made from cow's milk, butter can also be manufactured from the milk of other mammals, including sheep, goats, buffalo, and yaks. It is made by churning milk or cream to separate the fat globules from the buttermilk. Salt has been added to butter since antiquity to help preserve it, particularly when being transported; salt may still play a preservation role but is less important today as the entire supply chain is usually refrigerated. In modern times, salt may be added for taste.[1] Food coloring is sometimes added to butter.[2] Rendering butter, removing the water and milk solids, produces clarified butter, or ghee, which is almost entirely butterfat.

Butter is a water-in-oil emulsion resulting from an inversion of the cream, where the milk proteins are the emulsifiers. Butter remains a firm solid when refrigerated but softens to a spreadable consistency at room temperature and melts to a thin liquid consistency at 32 to 35 °C (90 to 95 °F). The density of butter is 911 g/L (15+14 oz/US pt).[3] It generally has a pale yellow color but varies from deep yellow to nearly white. Its natural, unmodified color is dependent on the source animal's feed and genetics, but the commercial manufacturing process sometimes alters this with food colorings like annatto[4] or carotene.

  1. ^ Institute of Medicine. Committee on Strategies to Reduce Sodium Intake; Henney, Jane E.; Taylor, Christine Lewis; Boon, Caitlin S. (2010). "4: Preservation and Physical Property Roles of Sodium in Foods". Strategies to reduce sodium intake in the United States. Washington, D.C. ISBN 978-0-309-14805-4. OCLC 676698420. Archived from the original on 9 May 2022. Retrieved 14 June 2022. {{cite book}}: |website= ignored (help)CS1 maint: location missing publisher (link)
  2. ^ "Butter coloring". Archived from the original on 2 January 2023. Retrieved 2 January 2023.
  3. ^ Elert, Glenn. "Density". The Physics Hypertextbook. Archived from the original on 19 August 2018. Retrieved 26 March 2018.
  4. ^ Saïd, Husein; Nada, I. A. A. (1946). "A Substitute for 'Annatto' in Butter". Nature. 157 (3982): 232. Bibcode:1946Natur.157..232S. doi:10.1038/157232a0. PMID 21017927. S2CID 4131974.