ammonia and water vapour
carbon dioxide
nitrogen
hydrogen
to increase the output
to increase the efficiency
to save fuel
to reduce the exit temperature
10:1
15:1
20:1
60:1
2-stroke engine
4-stroke petrol engine
4-stroke diesef engine
gas turbine.
varies as square root of the speed
Varies linearly to the speed
varies as square of the speed
varies as cube of the speed