{
  "id": "UN973",
  "name": "British thermal unit (thermochemical)",
  "ml_name": "ip_Btu_{th}",
  "symbol": "Btu_{th}",
  "reference": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8#B"
}