How does a nos system in a car works?

nos system is basically added in a car to cause massive increase in speed.nos or nitrous system works when the driver pushes the button.it can increase power as little as 0.5hp or much as 3,000hp depending on the engine type and nitrous system type. nos are of different types and power 2x nitrous power;5x nitrous power and 10x nitrous power, the most powerful is 10x.nos can only be installed in cars having horsepower more than 550.