When water is heated beyond the boiling point, it vaporizes into steam or water in the gaseous state. Saturated steam generated when water is heated to the boiling point and when further heated above the saturation point, it becomes super-heated steam. That is said to have temperature and pressure compensation, which is essential. in steam measurement. The purpose of a steam flow meter with temperature and pressure compensation is that when the volume deviates, the actual flow compensation will correct the result well. When steam is in gas state, the density varies with the changes in temperature and pressure. If you don’t have the compensation, it will cause a huge error.