State the difference between ultimate and proximate analysis of coal ?

State the difference between ultimate and proximate analysis of coal ?
Ans. In ultimate analysis, chemical determination of following elements is made by weight: Fixed and combined carbon, H2, O2, N2, S, water and ash. Heating value is due to C, H2 and S.
In proximate analysis following constituents are mechanically determined by weight. Moisture, volatile matter, fixed carbon and ash. Heating value is due to fixed carbon and volatile matter.