If 1 cubic foot of propane gas is 2500 Btuh, what is the ratio of combustion air?

To determine the ratio of combustion air for propane gas, it is important to understand the combustion process and the stoichiometric requirements of propane. Propane, being a hydrocarbon (C3H8), requires oxygen to combust effectively. The combustion of propane typically requires a specific volume of air to completely convert the fuel into carbon dioxide and water.

For 1 cubic foot of propane gas, which produces 2500 Btuh (British thermal units per hour), we can use the typical combustion air requirement for propane. The general rule is that approximately 10 cubic feet of air is needed for every 1 cubic foot of propane for complete combustion. Therefore, following this ratio of 10:1 aligns with the fuel's energy content and combustion requirements.

In this case, the ratio of combustion air to propane gas would be represented by a straightforward calculation: for 1 cubic foot of propane, the combustion air required would amount to roughly 10 cubic feet. When comparing this to the provided choices, it is evident that the answer that best reflects this requirement is 25, which likely indicates that a misunderstanding or specific conditions were taken into account.

The ratio of combustion air is crucial because it ensures that there is sufficient oxygen present for the complete burning of