If you are familiar with the HP50g system of Units then you can skip this.
ISO6976 has a small units conversion utility similar to the main UNITS application provided with the calculator and the same comments apply.
To access this use ÅCUSTOM
There are six entries : Energy, Density, CV, EFlow, VFlow and Back. The Energy units are similar to those in the standard HP50g Energy but come in multiples commonly used in the gas industry. Similarly EFlow (energy flow) should be called Power.
Pressing Back will take you back to the original menu (Main or Output).
For example: To use this CV menu to convert 1 MJ/m^3 to BTU/ft^3