Question

What is combustion?

• A. It is physical reaction.
• B. It is chemical reaction, in which a substance reacts in the absence of oxygen.
• C. It is a chemical process in which a substance reacts rapidly with carbon dioxide and absorbs heat.
• D. It is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.

Answer 1

The correct option is D

It is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid.