What is the Btu content per cubic foot of natural gas?

• A. 800
• B. 1000
• C. 1200
• D. 900

Answer: (B)

The amount of heat you get from burning natural gas is measured per unit volume, so the Btu content per cubic foot tells you how much energy is released when one cubic foot is burned. Natural gas is mainly methane, and its energy per volume is around 1,000 Btu per cubic foot under common conditions. This value is the standard reference used in HVAC for sizing burners, meters, and fuel calculations because actual gas composition varies, but the energy per volume stays near this figure. In more precise terms, the higher heating value is typically a bit above 1,000 Btu/ft^3 (about 1,030 Btu/ft^3) and the lower heating value a bit below (roughly 970–990 Btu/ft^3), but 1,000 Btu/ft^3 is the conventional figure used for practical calculations. The other options would imply a notably different energy content than what natural gas typically provides, so they’re not used for standard design and billing contexts.