Encyclopedia > Gas constant

  Article Content

Molar gas constant

Redirected from Gas constant

Molar gas constant (also known as universal gas constant, usually denoted by symbol R) is the constant occurring in the universal gas equation, i.e. the equation of state of an ideal gas:
pV = nRT
Here p is the pressure of gas, V the volume it ocupies, n the number of moles of gas, and T its temperature.

It can be shown that R is an universal constant, equal for all gases. Real gases obey this equation only in an approximation of very diluted gases.

Its value is:

R = 8.314,570(70) J K-1 mol-1

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

The Boltzmann constant kB is defined as a ratio of molar gas constant and the Avogadro's number:

<math>k_B = \frac{R}{N_A}</math>

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
List of China-related topics

... syndrome - Sex-selective abortion - Sex-selective infanticide - Shaanxi - Shandong - Shandong Peninsula[?] - Shang Dynasty - Shang Ti - Shanghai - Shanghai Cooperatio ...