No Luck Storing At 81.5 oC

A web grab (https://people.nscl.msu.edu/~daniel/bicofa.htm) of a thermal flask cooling profile from 100 ^oC indicates that water does not have a stable temperature at 81.5 ^oC.

The bottle's temperature is stable at the ambient of 20 ^oC.

It seems that 85.24 K is where supercooled water resist further cooling. (post "Water Bombed And Cryogenic Hydrogen" dated 8 Nov 2017)

Is boiling and freezing water nuclear processes?

Water bombed again.