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heat of cracking

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  • Heat treatment — is a method used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment… …   Wikipedia

  • cracking — n. 1. the act of cracking something. Syn: fracture, crack. [WordNet 1.5] 2. (Chem.) the process of making lower molecular weight hydrocarbons from heavier hydrocarbons in petroleum, by exposure to heat and catalysts. It is used to convert heavier …   The Collaborative International Dictionary of English

  • cracking — ☆ cracking cracking1 [krak′iŋ] adj. excellent; fine adv. Informal very cracking2 [krak′iŋ] n. the process of breaking down heavier hydrocarbons by heat and pressure or by catalysts into lighter hydrocarbons of lower molecular weight, as in… …   English World dictionary

  • Cracking (chemistry) — In petroleum geology and chemistry, cracking is the process whereby complex organic molecules such as kerogens or heavy hydrocarbons are broken down into simpler molecules such as light hydrocarbons, by the breaking of carbon carbon bonds in the… …   Wikipedia

  • cracking — /krak ing/, n. 1. (in the distillation of petroleum or the like) the process of breaking down certain hydrocarbons into simpler ones of lower boiling points by means of excess heat, distillation under pressure, etc., in order to give a greater… …   Universalium

  • cracking — 1. A general term covering any of a variety of reactions and processes that convert high boiling fractions to more valuable lower boiling fractions. 2. A secondary refining process that uses heat and/or a catalyst to break down large chemical… …   Petroleum refining glossary

  • cracking — [1] The action of opening a valve slightly and then closing the valve immediately. [2] forming of cracks for instance in the sidewalls of a tire because of the hardening of the rubber or in paintwork because of weathering. Also see heat cracking… …   Dictionary of automotive terms

  • cracking — /ˈkrækɪŋ / (say kraking) noun 1. (in the distillation of petroleum or the like) the process of breaking down certain hydrocarbons into simpler ones of lower boiling points, by means of excess heat, distillation under pressure, addition of a… …  

  • cracking — I. adjective Date: 1830 very impressive or effective ; great II. adverb Date: 1903 very, extremely < a cracking good book > III. noun Date: 1868 …   New Collegiate Dictionary

  • cracking —    A refining process involving decomposition and molecular recombination of organic compounds, especially hydrocarbons obtained by distillation of petroleum, by means of heat, to form molecules suitable for various uses such as motor fuels,… …   Forensic science glossary

  • heat cracking — A pattern of small, irregular cracks (e.g., on brake discs) …   Dictionary of automotive terms

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