If one cubic foot of Natural Gas is 1000 BTUH, what is the ratio of Total Air?

When considering the combustion of natural gas, it’s essential to understand the air-to-fuel ratio necessary for efficient burning. For natural gas, the approximate stoichiometric requirement is about 10:1, meaning roughly 10 parts of air for every one part of natural gas by volume for complete combustion.

In this context, if one cubic foot of natural gas produces 1000 BTU/hr, the total air needed for complete combustion can be calculated. A common conversion in gas combustion is that 1 cubic foot of natural gas approximately requires around 10 cubic feet of air to achieve optimal combustion.

To convert this to a ratio, we can use the 1000 BTUH output in relation to the BTU content of air, leading to a total air requirement ratio that typically aligns closely with 30, based on standard combustive calculations and factors considering the complete combustion efficiency.

Consequently, understanding that 30 represents a balance between the requirements of air and the energy produced by natural gas leads to the conclusion that the ratio of total air to natural gas in this scenario is indeed around 30. This is why option B is identified as the correct choice.