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Gypsum plaster (plaster of Paris) Gypsum plaster, also known as plaster of Paris, is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite. Etymology. The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
Mar 14, 2024 · plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
- The Editors of Encyclopaedia Britannica
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum ( calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris .
- Massive, flat. Elongated and generally prismatic crystals
- Prismatic (2/m), H-M symbol: (2/m)
- 1.5–2 (defining mineral for 2)
- Monoclinic
Plaster of Paris is a white powdery chemical compound that is hydrated calcium sulphate. It is used for sculpting materials, making gauze bandages, and setting fractured bones. Learn how to make plaster of Paris, its properties, and its different types such as gypsum, clay, lime, cement, and heat resistant plaster.
- 7 min
- What is the chemical composition of gypsum?Gypsum is made of hydrated calcium sulfate. Its chemical formula is CaSO 4 .2H 2 O.
- How is gypsum different from the plaster of Paris?Gypsum is different from the plaster of Paris in terms of its water of crystallisation. Gypsum has two moles of water of crystallisation, whereas p...
- How is the plaster of Paris formed?The plaster of Paris, abbreviated as POP, is formed by heating gypsum at 373 K. Gypsum loses its water molecules and forms calcium sulfate hemihydr...
- What is the composition of lime plaster?Lime plaster is made of sand and calcium hydroxide.
- What is the use of POP?POP has many uses. One of the main uses is that it is used to make casts for statues and moulds. It is also used in ornamental casting.
Feb 18, 2024 · Key Takeaways: Plaster of Paris is a gypsum-based casting material used for sculpting and creating orthopedic casts. Its ability to harden quickly when mixed with water makes it ideal for various art and craft projects. Plaster of Paris has a long history of use in construction, art, and medicine.
Originally, the term ‘plaster of Paris’ was coined in the 1700s to describe plaster produced from gypsum located outside of Paris. Over time, the term ‘plaster of Paris’ has become the generic term for gypsum-based plaster. Many ancient Egyptian tomb paintings are created on plaster.
