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standard substance

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  • Substance dependence — Substance dependency Classification and external resources ICD 10 F10.2 F19.2 ICD 9 …   Wikipedia

  • Substance abuse — Classification and external resources Comparison of the perceived harm for various psychoactive drugs from a poll among medical psychiatrists specialized in addiction tr …   Wikipedia

  • Standard solution — is a chemical term which describes a solution of known concentration. The concentration of the solution is normally expressed in units of moles per Litre (mol/L, often abbreviated to M for molarity). Standard solutions are normally used in… …   Wikipedia

  • Standard enthalpy change of formation — The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the… …   Wikipedia

  • Standard state — In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals exactly). This pressure was changed from 1 atm (101.325 kilopascals) by IUPAC in 1990. [GoldBookRef | file = S05910 | title = standard conditions for gases] The …   Wikipedia

  • Standard curve — A standard curve is a quantitative research tool, a method of plotting assay data that is used to determine the concentration of a substance, particularly proteins and DNA. It can be used in many biological experimentsThe assay is first performed …   Wikipedia

  • Standard molar entropy — In chemistry, the standard molar entropy is the entropy content of one mole of substance, under standard conditions (not standard temperature and pressure STP).The standard molar entropy is usually given the symbol S o, and the units joules per… …   Wikipedia

  • Substance médicamenteuse — Médicament Gélules Ampoule …   Wikipédia en Français

  • Substance Abuse —    Before the middle of the nineteenth century, the main substance capable of being abused was alcohol. With the rise of such anesthetic gases as ether (first used medically in 1846), of injectable opiate narcotics (after the introduction of the… …   Historical dictionary of Psychiatry

  • substance — substanceless, adj. /sub steuhns/, n. 1. that of which a thing consists; physical matter or material: form and substance. 2. a species of matter of definite chemical composition: a chalky substance. 3. See controlled substance. 4. the subject… …   Universalium

  • Standard conditions for temperature and pressure — Not to be confused with Standard state. In chemistry, standard condition for temperature and pressure (informally abbreviated as STP) are standard sets of conditions for experimental measurements, to allow comparisons to be made between different …   Wikipedia

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