Gas constant

Values of R

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8.314472 J · K-1 · mol-1

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0.08205746 L · atm · K-1 · mol-1

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8.2057459 x 10-5 m³ · atm · K-1 · mol-1

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8.314472 L · kPa · K-1 · mol-1

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62.3637 L · mmHg · K-1 · mol-1

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62.3637 L · Torr · K-1 · mol-1

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83.14472 L · mbar · K-1 · mol-1

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1.987 cal · K-1 · mol-1

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10.7316 ft³ · psi · °R-1 · lbmol-1

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The gas constant (also known as the universal or ideal gas constant, usually denoted by symbol R for Rydberg) is a physical constant used in equations of state to relate various groups of state functions to one another.

Related Topics:
Rydberg - Physical constant - Equations of state - State function

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The gas constant occurs in the simplest equation of state, the ideal gas equation, as follows:

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:

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p = {RTover{ ilde{V}}}

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where p is the pressure of an ideal gas, T is its temperature, and ilde{V} is its molar volume. R also appears in the Nernst equation as well as in the Lorentz-Lorenz formula. P = power but p = pressure.

Related Topics:
Pressure - Ideal gas - Temperature - Molar volume - Nernst equation - Lorentz-Lorenz

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Its value is:

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:R = 8.314472 J · K-1 · mol-1

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The two digits in brackets signify the uncertainty (standard deviation) in the last two digits of the value.

Related Topics:
Brackets - Standard deviation

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The gas constant is conversion factor between gas units. It tells how many joule per kelvin make a mol.

Related Topics:
Joule - Kelvin - Mol

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The Boltzmann constant kB is defined as a ratio of molar gas constant and the Avogadro's number (Avogadro's number is approximately 6.022 × 1023 particles/mole):

Related Topics:
Boltzmann constant - Avogadro's number

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:

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k_B = rac{R}{N_A}

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The Boltzmann constant is conversion factor between gas units. It tells how many joule per kelvin make a molecule.

Related Topics:
Joule - Kelvin - Molecule

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With it we can write the ideal gas equation:

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:

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qquad PV=Nk_BT

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with N = nNA is the actual number of molecules.

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