What is meant by "diffuse fuel"?

"Diffuse fuel" refers to a mixture of combustible materials that is dispersed in the atmosphere, allowing it to support flame propagation. In this context, diffuse fuel typically includes materials such as vaporized fuels or particulates that are dispersed in air. The dispersion of the fuel enhances its ability to mix with oxygen, which is crucial for combustion.

When we consider this definition, it becomes clear that a diffuse fuel is not a solid or concentrated source of fuel; rather, it is characterized by its ability to exist in a dispersed form that promotes a more efficient burning process. For instance, gases such as propane or gasoline vapor can become diffuse when mixed with air, thus allowing for easy ignition and combustion across a wide area, unlike solid fuels that typically need to be in a compact form to burn.

This understanding helps to differentiate diffuse fuels from other fuel forms, which may not possess the same ability to ignite or propagate flame under similar conditions.