Combustion is described as what?

Combustion is described as what?

• A. The combination of fuel and oxygen releasing heat.
• B. Condensation of vapor into liquid.
• C. A reaction that consumes heat.
• D. A chemical change with water only.

Answer: (A)

Combustion is the rapid chemical reaction of a fuel with an oxidizer, usually oxygen from the air, that releases energy as heat (and often light). In HVAC systems, fuels like natural gas or propane react with oxygen to form products such as carbon dioxide and water, with heat that warms the surroundings. This is an exothermic process, meaning it releases heat, unlike processes that absorb heat or involve only a phase change such as condensation. It’s also a chemical change, not just a physical one, and it relies on having a fuel, an oxidizer, and enough heat to start the reaction.

Combustion is the rapid chemical reaction of a fuel with an oxidizer, usually oxygen from the air, that releases energy as heat (and often light). In HVAC systems, fuels like natural gas or propane react with oxygen to form products such as carbon dioxide and water, with heat that warms the surroundings. This is an exothermic process, meaning it releases heat, unlike processes that absorb heat or involve only a phase change such as condensation. It’s also a chemical change, not just a physical one, and it relies on having a fuel, an oxidizer, and enough heat to start the reaction.