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Possibly wrong liquid-phase viscosities for 2-methylpropan-1-ol (isobutanol) #167

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20cristian02 opened this issue Feb 21, 2025 · 0 comments

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@20cristian02
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I am fetching the properties using the CAS number and the Chemical package:

import thermo
from thermo.chemical import Chemical

cas = "78-83-1"

com = Chemical(cas)
print(com.mul)
print(com.nul)

This yields roughly 6092996 Pa s and 7632 m² s⁻¹ for the dynamic and kinematic viscosities respectively (I am fairly certain the module uses SI units by default). For comparison, the module reveals the same properties for the isomer 1-butanol to be 2.55 mPa s (aka cP) and 3.17 cSt for dynamic and kinematic respectively; this is closer to reality. There is no way the two values for isobutanol are correct, as they would be in the billions of cP and cSt.

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