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The Fuel rollout controls the simulation of burning. It can be useful for gasoline explosions, or propagating fire, or other special effects that require more control over burning.

The process of burning depends on two 'regular' voxel channels (Fuel, Smoke) and a third, imaginary channel (Oxygen).

• Oxygen is calculated as the remaining volume which is not occupied by Fuel and Smoke for a given cell / voxel. For example, if in a certain voxel you have 0.4 Fuel and 0.4 Smoke, the Oxygen would be 0.2 (for a total volume of 1 for the voxel). Burning occurs only in voxels which have both Fuel and Oxygen. If a voxel has no Fuel, or is already full of Smoke and Fuel, it won't burn at all.
• Fuel is ignited if the Temperature in a given voxel is above the Ignition Temp. parameter.
• When the Fuel burns, it releases more Temperature based on the Energy parameter.
• When the Fuel burns, it releases Smoke based on the Smoke Amount parameter.
• When the Fuel burns, it adds expanding pressure to the simulation based on the Propagation parameter. It can be animated to create explosive effects.

The burning strength is determined by the smaller of the values of the Fuel and Oxygen channels:

• If there is 0.1 Fuel, 0.1 Smoke and 0.8 Oxygen in a voxel, the strength would be 0.1 -  the burning will be weak as there is not enough Fuel to ignite strongly. 
• If there is 0.8 Fuel, 0.1 Smoke and 0.1 Oxygen in a voxel, burning will be weak again because the voxel is overflown with Fuel - there is not enough Oxygen to help the burning.