Recently - from YT recommended - I learned about Glauber's salt (sodium sulfate). Glauber's salt is a PCM phase-change material that melts at 90F / 32.4C and s

Recently - from YT recommended - I learned about Glauber's salt (sodium sulfate). Glauber's salt is a PCM phase-change material that melts at 90F / 32.4C and starts absorbing thermal energy.