Which of the following substances is a liquid fuel used in rocket engines A. liquid oxygen
B. Ammonia
c. potassium perchiorate
D. codium nitrate
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http://en.wikipedia.org/wiki/Liquid-propellant_rocket#Propellants
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The liquid fuel used in rocket engines is A. liquid oxygen. To arrive at the correct answer, it helps to have some basic knowledge about rocket engines and their fuel systems.
Rocket engines work on the principle of combustion, where a fuel and an oxidizer are combined to produce thrust. In the case of liquid-fueled rocket engines, the fuel and oxidizer are stored separately and mixed together in the combustion chamber.
Liquid oxygen (LOX) is commonly used as an oxidizer in rocket engines due to its high reactivity with other combustible materials. It is a cryogenic liquid, meaning it is extremely cold and stored at very low temperatures to maintain its liquid state.
On the other hand, ammonia (B) is not typically used as a liquid fuel in rocket engines. It can be utilized as a propellant in some rockets, but it is more commonly used for its heat-absorbing properties in cooling systems.
Potassium perchlorate (C) and sodium nitrate (D) are both oxidizers but are not used alone as liquid fuels in rocket engines. They are often combined with other substances to form solid rocket propellants.
Therefore, the correct answer is A. liquid oxygen, which serves as the oxidizer in rocket engines.