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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 The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...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
Download Now. Plaster of Paris is also referred to as gypsum plaster. The chemical formula of plaster of Paris is written as CaSO4· 1/2 H2O. Properties of Plaster of Paris. Some of the important properties of the plaster of Paris are as follows: Usually white in colour and available in powder form.
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- 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.
Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates. In the form of γ- anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum.
- CaSO₄
- 136.14 g/mol (anhydrous), 145.15 g/mol (hemihydrate), 172.172 g/mol (dihydrate)
- 1,460 °C (2,660 °F; 1,730 K) (anhydrous)
- 0.26 g/100ml at 25 °C (dihydrate)
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.
Construction: Plaster of Paris is a preferred material for creating decorative elements in architecture. It is also used for creating smooth surfaces on walls or ceilings, owing to its ability to harden upon contact with water.
