Which color flame is characteristic of complete combustion of propane?

The blue flame is characteristic of complete combustion of propane. In a complete combustion process, propane reacts with an adequate supply of oxygen, which results in a clean, efficient burn producing carbon dioxide and water vapor as the primary byproducts. The blue color indicates that the fuel is burning efficiently at a high temperature, indicating optimal combustion conditions.

When propane burns completely, you achieve maximum energy output along with minimal soot or particulates. A blue flame is a sign that there is sufficient oxygen mixed with the propane, leading to the ideal combustion process.

In contrast, flames of other colors can indicate incomplete combustion. For instance, yellow and red flames can suggest that there is not enough oxygen, leading to the production of carbon monoxide and soot, which are indicators of inefficiency and increased pollutants. A green flame is not typically associated with propane combustion and often indicates the presence of certain metals or chemical reactions unrelated to propane fuel.