# How Do Rockets Work?

A rocket engine is generally throwing mass in the form of a high-pressure gas. The engine throws the mass of gas out in one direction in order to get a reaction in the opposite direction. The mass comes from the fuel that the rocket engine burns. The power of a rocket engine is called its thrust. Thrust is measured in 'pounds of thrust'. A pound of thrust is the amount of power it would take to keep a 1-pound object stationary against the force of gravity on Earth. So on Earth, the acceleration of gravity is 32 feet per second per second. Solid-fuel rocket engines were the first rockets created by man. They were invented hundreds of years ago in China and have been used widely since then.
Q&A Related to "How Do Rockets Work"
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