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Rep or REP may refer to:

• Rep (fabric), a ribbed woven fabric made from various materials
• rep, the Röntgen equivalent physical, a unit of exposure to radiation
• REP, an x86 assembly language instruction (abbreviation of repeat)
• Johnny Rep, a former Dutch footballer
• Rab escort protein
• Radioisotope electric propulsion
• Reasonable expectation of privacy, a legal test in United States constitutional law
• Rede dos Emissores Portugueses, an amateur radio organization in Portugal
• Régiment Étranger de Parachutistes, a French foreign legion parachute unit
• The Republicans (Germany), a political party in Germany
• Republicans for Environmental Protection, a United States Republican Party organization which supports environmental protection policies
• Retail Electricity Provider, a retailer of electric power services in the United States (particularly Texas) and other jurisdictions
• Siem Reap International Airport (IATA airport code), Cambodia
• Robert Esnault-Pelterie, an early French aircraft manufacturer
• Robot Exclusion Protocol or robots exclusion standard
• The Routledge Encyclopedia of Philosophy
• Resident Evil Portable

Rep is used as an abbreviation for:

• Representative (disambiguation)
• Repertory theatre, a theatre term
• Repetition (disambiguation)
• Reputation

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Ice cubes in a glass of iced tea

Ice cubes are small, roughly cube-shaped pieces of ice, conventionally used to cool beverages. Ice cubes are sometimes preferred over crushed ice because they melt more slowly; they are standard in mixed drinks that call for ice, in which case the drink is said to be "on the rocks."

Ice cubes that are crushed or sheared into irregularly-shaped flakes may add an interesting aesthetic effect to some cocktails. Crushed ice is also used when faster cooling is desired, since the rate of cooling is governed by the number and average radius of the ice particles.^[1]

Melting ice cubes sometimes precipitate white flakes, commonly known as "floaties". This is calcium carbonate which is present in many water supplies and is completely harmless.^{[citation needed]}

Origin[link]

Gorrie's ice machine.

American physician and humanitarian John Gorrie built a refrigerator in 1844 with the purpose of cooling air. His refrigerator produced ice which he hung from the ceiling in a basin. Gorrie can be considered the creator of ice cubes, but his aim was not to cool drinks: he used the ice to lower the ambient room temperature. During his time, a dominant idea was that bad air quality caused disease. Therefore, in order to help treat sickness, he pushed for the draining of swamps and the cooling of sickrooms.

Methods of production[link]

Ice cubes are produced domestically by filling an ice cube tray with water and placing it in a freezer. Many freezers also come equipped with an icemaker, which produces ice cubes automatically and stores them in a bin from which they can be dispensed directly into a glass.

Ice cube tray[link]

Ice cubes in a tray

Ice cube trays are designed to be filled with water, then placed in a freezer until the water freezes to ice, producing ice cubes. Trays are often flexible, so the frozen cubes can be easily removed by flexing the tray. Twist ice trays have a simple spring loaded mechanism with a lever that is used to turn the tray upside down and flex at the same time such that the cubes drop are collected in a removable tray below and return the ice cube tray to its upright position without removing it from the freezer which can save time and reduces accidents and mess, though the tray has to be removed to be collected and the ice cube tray still has to be removed to be refilled. An alternative system is an aluminum tray with a lever that raises the ice cubes, freeing them from the tray. A motorized version of this is found in most automatic ice-making freezers.

While the usual shape of the ice 'cube' is roughly cubical, there are trays that dispense hemispherical or cylindrical blocks. These are commonly referred to as ice tubes. Some novelty trays produce blocks of ice in seasonal, festive or other shapes.

The first rubber ice cube tray was invented by Lloyd Groff Copeman. One day in 1928, while walking through some woods collecting sap for maple syrup, Copeman noticed that slush and ice flaked off his rubber boots rather than adhering to them. Having recalled this incident over lunch with his patent attorney, he conducted experiments using rubber cups. Later, he set about designing and then patenting different types of tray: a metal tray with rubber separators, a metal tray with individual rubber cups, and a tray made completely of rubber.^[2]

The first flexible stainless steel, all-metal ice cube tray was created by Guy L. Tinkham in 1933. The tray bent sideways to remove the ice cubes.

Several companies now offer pre-filled disposable ice trays for home freezing, which they claim provide better taste and reduced risk of contamination.^[3]

Large-scale ice cube production[link]

Dedicated ice-maker machines can be used to produce ice cubes for laboratories and academic use. Ice cubes are also produced commercially and sold in bulk; these ice cubes, despite their name, are often cylindrical, and may have holes through the center.

An interesting characteristic of commercially made ice cubes is that they are completely clear, lacking the clouding found in the center of domestically made ice cubes. Cloudy ice cubes result when water is frozen quickly, or when the water is high in dissolved solids. When water is cooled to its freezing point, and ice starts to form, dissolved gases can no longer stay in solution and come out as microscopic bubbles. However, as ice floats in water, once there is enough ice to form a layer on the surface, the ice layer traps all bubbles within the ice cube. Commercial ice-makers use a flowing source of purified water to make ice with cooling elements at the bottom, allowing the bubbles to be washed away from the top as the cube grows.^{[citation needed]}

See also[link]

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• Ice pack
• Pagophagia
• Refrigeration
• Ice

References[link]

1. ^ Rauch, Jeffrey (1975). "The mathematical theory of crushed ice". Partial differential equations and related topics (Program, Tulane Univ., New Orleans, La., 1974). Berlin, New York (the state): Springer-Verlag. pp. 370–379. MR0427863. 
2. ^ "www.lloydcopeman.com: Biography". http://www.lloydcopeman.com/biography/CopemanStory.pdf. 
3. ^ "After Bottled Water? Purified Ice Cubes". http://www.aquaice.com/PressRelease_WSJ_2006.htm. Retrieved 2008-06-03. 

External links[link]

Look up ice cube in Wiktionary, the free dictionary.

• Hot water can freeze faster than cold water (Subscription required)