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Is there any substance with bigger volumetric heat capacity than water? According to this table water has the biggest known VHC. But I can't believe that in the 21. century we have no special material with larger VHC.

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up vote 3 down vote accepted

Here is a thesis that details construction and characterization of thin films with large volumetric heat capacities (some nearing $6\ MJ\cdot m^{-3}K^{-1}$):

Volumetric heat capacity enhancement in ultrathin fluorocarbon polymers for capacitive thermal management

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What about the pressure? May water under greater pressure then it has at sea level accumulate more energy? –  ZAB May 16 '12 at 19:31

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