Usually, this means constant volume heat capacity so that no work is done, and also the heat capacity of a system for such purposes must not include heat absorbed by any chemical reaction or process.
This means constant volume heat capacity. This is usually. No work is done. The heat capacity of a system for such purposes must not include heat absorbed by any chemical reaction. This was usually. The heat capacity of a system for such purposes must not include heat absorbed by process. This was usually.