formula.expert
e.u.\text{e.u.}

entropy unit

Molar entropyexact by definition

The entropy unit is the calorie per mole kelvin, 4.184 J/(mol·K) on the thermochemical calorie. It is old chemistry shorthand: standard entropies were tabulated in e.u. through the middle of the twentieth century, where liquid water is 16.7 e.u. and the same figure is 69.9 J/(mol·K) today.

Watch out: Sources built on the IT calorie give 4.1868 instead of 4.184, a 0.1% difference. Older tables rarely state which calorie they used.

1 e.u.\text{e.u.} 4.184 J/(mol⋅K)\text{J/(mol}{\cdot}\text{K)}

One entropy unit in every molar entropy unit

4.184joule per mole kelvin (J/(mol·K))
4.184joule per mole Celsius (J/(mol·°C))
4.184kilojoule per kilomole kelvin (kJ/(kmol·K))
1calorie per mole kelvin (cal/(mol·K))
1entropy unit (e.u.)this unit
0.999331BTU per pound-mole Rankine (BTU/(lb-mol·°R))
0.50322Boltzmann constant per particle (kB/particle)
0.004184kilojoule per mole kelvin (kJ/(mol·K))
Solvers that use molar entropy

← Every unit on formula.expert