In calorimetry several terms are interchangeable:
- Lower Calorific Value
- Lower Heating Value
- Net Calorific Value
- Net Heating Value
The following terms also appear to have identical meanings:
- Higher Calorific Value
- Higher Heating Value
- Gross Calorific Value
- Gross Heating Value
- Gross Energy
So far I can think of several factors affecting which term should be used.
In the days of the early discoveries of calorimetry, Latin was just as much of a research language as English, so interchangeability of the terms calorimetric (which derives from the Latin word calor meaning heat) and heating would be understood.
The word value sounds like a non-specific reference to a number.
The unit Calorie is not part of the SI standard though it is derived from SI units. In the context of describing the energy required to raise the temperature of water it may be appropriate.
It seems like gross or net heat energy would be the best term for scientific usage. Does any standard or consensus exists which defines which of these terms are best to use?