Boltzmann constant per particle
Molar entropyexact by definition
One Boltzmann constant per particle is exactly 8.31446261815324 J/(mol·K), which is the gas constant, because R is k_B times N_A and both are exact since 2019. Statistical mechanics counts entropy in multiples of k_B per particle, so an entropy of "2 k_B per molecule" is 16.6 J/(mol·K).
Watch out: Information-theoretic work often sets k_B = 1 and reports entropy as a pure number of nats or bits. One bit per particle is k_B ln 2, which is 5.76 J/(mol·K), not 8.314.
| 1 | 8.3144626 |
One boltzmann constant per particle in every molar entropy unit
| 8.31446 | joule per mole kelvin (J/(mol·K)) | |
| 8.31446 | joule per mole Celsius (J/(mol·°C)) | |
| 8.31446 | kilojoule per kilomole kelvin (kJ/(kmol·K)) | |
| 1.9872 | calorie per mole kelvin (cal/(mol·K)) | |
| 1.9872 | entropy unit (e.u.) | |
| 1.98588 | BTU per pound-mole Rankine (BTU/(lb-mol·°R)) | |
| 1 | Boltzmann constant per particle (kB/particle)this unit | |
| 0.00831446 | kilojoule per mole kelvin (kJ/(mol·K)) |
Solvers that use molar entropy