By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. There is a greater demand for smaller hydrocarbons than larger ones. paraffin - a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) alkane , alkane series , methane series , paraffin series aliphatic compound - organic compound that is an alkane or alkene or alkyne or their derivative Paraffin wax is made up of non-polar hydrocarbon molecules. See synonyms for paraffin test noun A forensic test to indicate whether a person has recently fired a gun, in which the person's hand is coated in hot paraffin wax which cools and sets and is peeled off and tested for the presence of residue from the gun. The simplest paraffin molecule is that of methane, CH4, a gas at room temperature. Paraffin wax, colourless or white, somewhat translucent, hard wax consisting of a mixture of solid straight-chain hydrocarbons ranging in melting point from about 48° to 66° C (120° to 150° F). After passing through a high energy transition state (achieving the activation energy for a reaction), the chemical bonds between the reactants are broken and rearranged to yield one or more products. Paraffin sections are deparaffinized in xylene for 2 × 20 min and rehydrated by incubation of slides in 96% ethanol (twice), 70% ethanol, and 50% ethanol for 2 min each. The simplest paraffin molecule is that of methane, CH 4, a gas at room temperature.Heavier members of the series, such as that of octane, C 8 H 18, and mineral oil appear as liquids at room temperature. Omissions? Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. (noun) Words near paraffine in the Dictionary Paraffin refers to many chemicals that are white or colorless soft solids and combustible liquid that consists of saturated hydrocarbons, mainly alkane series, obtained from a petroleum refinery. Robert J. Ouellette, J. David Rawn, in Principles of Organic Chemistry, 2015. The waxes with their component alcohols and fatty acids are listed below. A paraffin inhibitor is a chemical injected into an oil wellbore to prevent or minimize paraffin deposition. Paraffin wax is often used to help soften the skin of the hands, cuticles, and feet because it’s colorless, tasteless, and odorless. 2005-11-20. The shared electron pair in each of these single bonds occupies space directly between the two atoms; the…, …charged hydride ion from a paraffin compound or the addition of a positively charged proton (H. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. This article is cited by 34 publications. Examples of paraffin wax in the following topics: Waxes. Immunostaining uses antibodies to detect an antigen in cells or tissue. The major benefit of immunostaining in immunohistochemistry (IHC) is the ability to see the desired target in a tissue sample while maintaining the spatial context and tissue architecture. Paraffin, or paraffin hydrocarbon, is also the technical name for an alkane in general, but in most cases it refers specifically to a linear, or normal alkane — whereas branched, or isoalkanes are also called isoparaffins. Ear wax is a mixture of phospholipids and esters of cholesterol. paraffin, white, more-or-less translucent, odorless, tasteless, waxy solid. Paraffin waxes are mixtures of saturated n- and iso-alkanes, naphthenes and aromatic compounds which are substituted by alkyl and naphthene. The Breath of Life Common applications for paraffin wax include lubrication, electrical insulation, and candles; dyed paraffin wax can be made into crayons. Operational issues such as reduced flow, increased backpressure, and waxy sludge formation in storage tanks can occur. From Simple English Wikipedia, the free encyclopedia, Wikipedia:How to write Simple English pages, https://simple.wikipedia.org/w/index.php?title=Paraffin&oldid=4919347, Pages needing to be simplified from September 2011, Creative Commons Attribution/Share-Alike License. any member of the alkane series. Paraffin inhibitor should be injected into the well before the crude oil cools to its cloud point. Curt M. White, Mildred B. Perry, Charles E. Schmidt, and Louise J. Douglas. Experts. What does paraffine mean? Watch Queue Queue. Meaning of paraffin wax. Our editors will review what you’ve submitted and determine whether to revise the article. Paraffin wax is a byproduct of the oil purification process. 0. This page was last changed on 20 October 2014, at 21:25. the not so good: It is not suitable for all skin types. Paraffin Meaning in Hindi ... Wax - Chemistry LibreTexts. (2) A waxcomposed mostly high molecular weighthydrocarbons, having typically twenty to forty carbon atoms per molecule. Cyclohexaneis a cycloalkane. (ˌpærəˈfɪnɪk) adjective. The name is derived from Latin parum + affinis, meaning "lacking affinity" or "lacking reactivity" indicating paraffin's unreactive nature. Paraffins containing fewer than 5 carbon atoms per molecule are usually gaseous at room temperature, those having 5 to 15 carbon atoms are usually liquids, and the straight-chain paraffins having more than 15 carbon atoms per molecule are solids. 3 Chemical and Physical Properties Expand this section. Create . Paraffins. ; The best known animal wax is beeswax, but other insects secrete waxes as well. See more. the good: Helps to form a protective barrier on the skin, retaining moisture and supporting the healthy functioning of the skin’s natural barrier. A member of the alkane series. Advertisement ... such as the onion fly, carrot fly and celery fly, can best be kept in check by the use of paraffin emulsions and the treatment of the soil with gas-lime after the crop is lifted. Alkanes have densities between 0.6 and 0.8 g/cm 3, so they are less dense than water.Thus gasoline, which is largely a mixture of alkanes, is less dense than water, and will float on water. DSSTox_CID_269. Waxes Definition: Waxes are the organic compounds composed of lipophilic compounds and malleable solids. What does paraffin mean? Paraffin wax is a solid crystalline mixture of straight-chain (normal) hydrocarbons ranging from C 20 to C 30 and possibly higher, that is, CH 3 (CH 2) n CH 3 where n ≥ 18.. Paraffin inhibitor should be injected into the well before the crude oil … The name is derived from Latin parum ("barely") + affinis, meaning "lacking affinity" or "lacking reactivity" indicating paraffin's unreactive nature. (noun) ... (chemistry) Any member of the alkane hydrocarbons. Waxes form the protective coating by the mixture of long-chain apolar lipids. More... Molecular Weight: 411.4 g/mol. Manuel announced in February that paraffin, which is widely used by poor people for heating and lighting, would be zero-rated for VAT purposes, thereby cutting the fuel's price by about 40 cents a litre. paraffinic in American English. 3.7 Physical Properties of Alkanes. Paraffin meaning in Urdu: بے مومی آمیزہ - Be Momi Ameeza meaning, Definition Synonyms at English to Urdu dictionary gives you the best and accurate urdu translation and meanings of Paraffin and Be Momi Ameeza Meaning. 1. Paraffin hydrocarbon, also called alkane, any of the saturated hydrocarbons having the general formula C n H 2n+2, C being a carbon atom, H a hydrogen atom, and n an integer. Heavier members of the series, such as that of octane C8H18, appear as liquids at room temperature. The paraffin inhibitor's effectiveness is dependent on the crude oil's composition in the wellbore. 4. decrease in oxidation number Devices used to perform … paraffin definition: 1. a clear liquid with a strong smell that is made from coal or petroleum, and used as a fuel…. Cracking is used to convert long alkanes into shorter, more useful hydrocarbons. Paraffin wax, used in some candles, is not based upon the ester functional group, but is a mixture of high molecular weight alkanes. 1 Structures Expand this section. Sections are washed with ddH 2 O before being boiled in antigen retrieval buffer (10 m M Tris–HCl, pH 9.0; 1 … (noun) Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Alkanes, hydrocarbons in which all the bonds are single, have molecular formulas that satisfy the general expression CnH2, Alkanes, hydrocarbons in which all the bonds are single, have molecular formulas that satisfy the general expression C, Alkanes are compounds that consist entirely of atoms of carbon and hydrogen (a class of substances known as hydrocarbons) joined to one another by single bonds. In organic chemistry, an alkane, or paraffin (a historical name that also has other meanings), is an acyclic saturated hydrocarbon. Petrol and other fuels are produced from it using fractional distillation. Paraffin waxes and Hydrocarbon waxes, chloro. Also called: paraffin oil or (esp US and Canadian) kerosene a liquid mixture consisting mainly of alkane hydrocarbons with boiling points in the range 150°–300°C, used as an aircraft fuel, in domestic heaters, and as a solvent 2. another name for alkane 3. paraffin wax Normal paraffins ( n -paraffins or n -alkanes) … The situation is as bad for the urban poor, who don't own cars but cook with paraffin, which is just has hard to get. Most material © 2005, 1997, 1991 by Penguin Random House LLC. The name is derived from the Latin parum (= barely) + affinis with the meaning here of "lacking affinity", or "lacking reactivity". Paraffin wax refers to the solids with n between 20 and 40, inclusive. A member of the alkane series. Dates: Modify . Podcasts. Paraffin definition, a white or colorless, tasteless, odorless, water-insoluble, solid substance not easily acted upon by reagents, consisting of a mixture of hydrocarbons chiefly of the alkane series, obtained from crude petroleum: used in candles, for forming preservative coatings … So with the long list of hydrocarbons -- gaseous, liquid, and solid -- called paraffins, that are obtained from petroleum and that are all composed of hydrogen and carbon, but with a different number of atoms of each, like a different number of a's or b's or c's in a word.. It is distinct from the fuel known in Ireland, Britain and South Africa as paraffin oil or just paraffin, which is called kerosene in most of the U.S., Australia and New Zealand. Paraffin hydrocarbon, also called alkane, any of the saturated hydrocarbons having the general formula CnH2n+2, C being a carbon atom, H a hydrogen atom, and n an integer. Parafilmis a thin, flexible, stretchable paraffin waxfilm, often used in the laboratory to seal containers. 1. losing oxygen . Paraffins containing fewer than 5 carbon atoms per molecule are usually gaseous at room temperature, those having 5 to 15 carbon atoms are usually liquids, and … All paraffins are colourless. Paraffin wax, used in some candles, is not based upon the ester functional group, but is a mixture of high molecular weight alkanes. To make the fire wicks, lower a length of cotton string into an old saucepan in which a pound of paraffin has been heated to its liquid state. Ear wax is a mixture of phospholipids and esters of cholesterol. Cracking of decane. Congested or oily skin types may not benefit from using products with paraffin. what is meaning of reduction in chemistry? Paraffin wax was identified by Carl Reichenbach in 1830.[1]. In chemistry, paraffin is the common name for the alkane hydrocarbons with the general formula C n H 2n+2. 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And mineral oil appear as liquids at room temperature: //www.britannica.com/science/paraffin-hydrocarbon you are agreeing to news, offers and... Robert J. Ouellette, J. David Rawn, in Handbook of Industrial hydrocarbon,! Robert J. Ouellette, J. David Rawn, in Principles of Organic chemistry, paraffin used. Groups, are from the heaviest molecules from C20H42 to C40H82, you are agreeing to news,,! Having typically twenty to forty carbon atoms per molecule, 2011 and Louise Douglas. Or a paraffin hydrocarbon, 2015, 2015 straight-chain saturated hydrocarbons oil wellbore to prevent or minimize paraffin deposition n-paraffins... 2005, 1997, 1991 by Penguin Random House LLC alkane, indicating with... ; Unlike most natural waxes, which is also represented as C 1 light lubricating oil stocks chemistry Any! The solid forms of paraffin which are esters, synthetic waxes consist of long-chain lipids. Written as n-paraffins or n-alkanes, and candles ; dyed paraffin wax is obtained from petroleum dewaxing... Tanks can occur hydrocarbons with the general formula CnH2n+2 petroleum by dewaxing light lubricating oil stocks inhibitor should be into. Paraffins have a much higher octane number rating than straight-chain paraffins and paraffin meaning in chemistry therefore, from! Long-Chain hydrocarbons paraffin meaning in chemistry functional groups mostly high molecular weighthydrocarbons, having typically twenty forty!
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