Preferred Label : British Thermal Unit 39 Degrees Fahrenheit;
NCIt synonyms : British Thermal Unit at 39 Degrees Fahrenheit; B.Th.U. (39F); B.T.U. (39F); BTU (39F);
NCIt related terms : [Btu_39]; British thermal unit (39 oF);
NCIt definition : A non-SI unit of energy equal to the amount of heat required to raise the temperature
of one pound avoirdupois of air-free water by one degree Fahrenheit (from 38.5 to
39.5 degrees) at a constant pressure of one atmosphere. The British thermal unit at
39 degrees Fahrenheit is based on the definition of the calorie value of water at
its maximum density (4 degrees Celsius), and is equal to approximately 1.05967 kJ.;
Codes from synonyms : 13041;
Origin ID : C69150;
UMLS CUI : C2347206;
Currated CISMeF NLP mapping
- Semantic type(s)
- concept_is_in_subset
