What amount of coal dust is sufficient to propagate a coal dust explosion?

The correct answer is indicated as 0.08 ounces per cubic foot of air, which is recognized as the threshold amount of coal dust necessary to create an environment conducive to a coal dust explosion. Coal dust is a highly combustible material, and when it reaches specific concentrations in the air, it can become explosive.

The concentration of 0.08 ounces per cubic foot is significant because it represents a balance between the amount of coal dust and the available oxygen in the air. At this concentration, the dust particles can disperse and remain suspended in the air, leading to a situation where they can ignite or explode if an ignition source is present.

Understanding this concentration is vital for safety protocols in mining and industries that handle coal, as exceeding this threshold increases the risk of an explosion. The information serves as a guideline for maintaining safe levels of coal dust in the air to prevent hazardous situations.