Universal Gas Constant | Definition, Value, Units, & Facts | Britannica

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External Websites

• University of Notre Dame - Journal of Chemical Education - The Universal Gas Constant R
• National Center for Biotechnology Information - PubMed Central - Measurement of the Universal Gas Constant R Using a Spherical Acoustic Resonator
• NIST Technical Series Publications - Measurement of the Universal Gas Constant Using an Acoustic Resonator (PDF)

universal gas constant chemistry and physics Ask Anything Homework Help Also known as: molar gas constant Written and fact-checked by Britannica Editors 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.... Britannica Editors History Britannica AI Ask Anything Homework Help Table of Contents Table of Contents Ask Anything

universal gas constant, (symbol R), fundamental physical constant arising in the formulation of the ideal gas law. For an ideal 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 that the mass of gas being compared is one mole, or one molecular weight in grams. For one mole, therefore, PV/T = R.

Also called: molar gas constant or gas constant (Show more) Related Topics: physical constant gas laws (Show more) See all related content

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 8.31446261815324 joules per kelvin (K) per mole. The universal gas constant is defined as Avogadro’s number NA times the Boltzmann constant k.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.