We know that the Potassium Nitrate (saltpeter)
Sugar acts as fuel, and potassium nitrate provides the oxygen needed for the combustion reaction to take place. The products are potassium carbonate, carbon dioxide gas, water, and nitrogen gas.
The Chemical equation for the reaction which produces energy in the form of heat, light and sound is
The large amount of gases released through a small opening provided at one end of rocket are capable of providing adequate propulsion.
Enjoy potassium nitrate-sugar Rocket being propelled.