molar gas constant

molar gas constant

▪ chemistry and physics
      (symbol R), fundamental physical constant arising in the formulation of the general gas law. For an ideal gas (perfect gas) (approximated by most real gases that are not highly compressed or not near the point of liquefaction), the pressure p times the volume V of the gas divided by its absolute temperature T is a constant. When one of these three is altered for a given mass of gas, at least one of the other two undergoes a change so that the expression pV/T remains constant. The constant, further, is the same for all gases, provided the mass of gas being compared is one mole, or one molecular weight in grams. For one mole, therefore, pV/T = R.

      The dimensions of the universal gas constant R are energy per degree per mole. In the metre-kilogram-second system the value of R is 8.31441 joules per Kelvin (K) per mole. Other frequently used equivalent values are 8.314 × 107 ergs per Kelvin per mole, 1.986 calories per Kelvin per mole, and 0.08207 litre-atmosphere per Kelvin per mole.

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • molar gas constant — molinė dujų konstanta statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. molar gas constant; universal gas constant vok. allgemeine Gaskonstante, f; ideale… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • molar gas constant — molinė dujų konstanta statusas T sritis Energetika apibrėžtis Idealiųjų dujų būsenos lygties (Klapeirono lygties) konstanta. Lygi Avogadro ir Bolcmano konstantų sandaugai; R = 8,31·10³ J/(kmol·K). atitikmenys: angl. molar gas constant; universal… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • molar gas constant — noun the constant occurring in the equation of state for an ideal gas, equal to about 8.314 J. mol. 1 K 1. Also, gas constant, universal gas constant …  

  • Gas constant — Values of R [1] Units (V P T −1 n−1) 8.3144621(75)[2] J K−1 mol−1 5.189× …   Wikipedia

  • universal gas constant — molinė dujų konstanta statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. molar gas constant; universal gas constant vok. allgemeine Gaskonstante, f; ideale… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • universal gas constant — molinė dujų konstanta statusas T sritis Energetika apibrėžtis Idealiųjų dujų būsenos lygties (Klapeirono lygties) konstanta. Lygi Avogadro ir Bolcmano konstantų sandaugai; R = 8,31·10³ J/(kmol·K). atitikmenys: angl. molar gas constant; universal… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • universal gas constant — noun → molar gas constant …  

  • gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …   Universalium

  • Molar volume — The molar volume, symbol Vm,[1] is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (ρ). It has the SI unit… …   Wikipedia

  • gas laws — /ˈgæs lɔz/ (say gas lawz) plural noun laws, especially Boyle s law and Charles s law, which relate the pressure, volume, and temperature of a gas. The combined ideal gas law states that for 1 mole of an ideal gas the product of the pressure and… …  

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”