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BTU/(lb-mol⋅∘R)\text{BTU/(lb-mol}{\cdot}^{\circ}\text{R)}

BTU per pound-mole Rankine

Molar entropyexact by definition

The BTU per pound-mole Rankine is exactly 4.1868 J/(mol·K), the unit of US chemical engineering entropy and molar heat capacity tables. The gas constant in it is 1.986, which is the same number chemists know as 1.987 cal/(mol·K).

1 BTU/(lb-mol⋅∘R)\text{BTU/(lb-mol}{\cdot}^{\circ}\text{R)} 4.1868 J/(mol⋅K)\text{J/(mol}{\cdot}\text{K)}
Where the unit came from

That the factor comes out at exactly 4.1868 is not chance: 4.1868 J is the international-table calorie, and the BTU and the IT calorie were defined from the same water-based convention. The imperial molar entropy unit and the calorie-based one are the same unit wearing different clothes.

One btu per pound-mole rankine in every molar entropy unit

4.1868joule per mole kelvin (J/(mol·K))
4.1868joule per mole Celsius (J/(mol·°C))
4.1868kilojoule per kilomole kelvin (kJ/(kmol·K))
1.00067calorie per mole kelvin (cal/(mol·K))
1.00067entropy unit (e.u.)
1BTU per pound-mole Rankine (BTU/(lb-mol·°R))this unit
0.503556Boltzmann constant per particle (kB/particle)
0.0041868kilojoule per mole kelvin (kJ/(mol·K))
Solvers that use molar entropy

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