Entropy and enthalpy for triggering cutaneous erythema

Steven L. Jacques*, Joseph T. Walsh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The molar entropy (ΔS) and molar enthalpy (ΔH) for the denaturation event that triggers cutaneous erythema was determined to be ΔS = 190 J/(mole K) and ΔH = 146.9 × 103 J/mole. The experiment involved placing heated water against the skin of the forearm, for a range of temperatures and exposure times. Exposing the skin to 45°C for 22 s was at the threshold for producing erythema, which was similar to the threshold for a slight degree of pain.

Original languageEnglish (US)
Article number1550026
JournalJournal of Innovative Optical Health Sciences
Issue number4
StatePublished - Jul 25 2015


  • Skin
  • enthalpy
  • entropy
  • erythema
  • thermal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Medicine (miscellaneous)
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering


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