What are the five factors that constitute the dust explosion pentagon?

What are the five factors that constitute the dust explosion pentagon?

• A. Fuel, oxidizer, ignition source, dispersion and confinement
• B. Pressure, temperature, humidity, catalyst, viscosity
• C. Volume, velocity, density, pH, color
• D. Flame temperature, ignition source, energy, oxygen, moisture

Answer: (A)

Dust explosions require five interrelated conditions to come together: a combustible dust (fuel), an oxidizer (air), an ignition source to start the flame, dispersion of the dust into a cloud at the right concentration, and confinement that allows pressure to build and the flame front to propagate. The five factors listed match this concept: the fuel provides the material to burn, the oxidizer supplies the oxygen, the ignition source supplies energy to initiate combustion, dispersion ensures the dust and air mix into a flammable cloud, and confinement allows rapid pressure rise during the reaction. If any one of these is missing or suppressed—for example, no dust cloud forms, there’s no sufficient oxygen, there isn’t an energy source to ignite, the dust isn’t properly dispersed, or there’s no confinement—the explosive chain reaction cannot occur. The other options include irrelevant properties (like humidity, temperature, viscosity, pH) or omit essential factors such as dispersion or confinement.

Dust explosions require five interrelated conditions to come together: a combustible dust (fuel), an oxidizer (air), an ignition source to start the flame, dispersion of the dust into a cloud at the right concentration, and confinement that allows pressure to build and the flame front to propagate. The five factors listed match this concept: the fuel provides the material to burn, the oxidizer supplies the oxygen, the ignition source supplies energy to initiate combustion, dispersion ensures the dust and air mix into a flammable cloud, and confinement allows rapid pressure rise during the reaction. If any one of these is missing or suppressed—for example, no dust cloud forms, there’s no sufficient oxygen, there isn’t an energy source to ignite, the dust isn’t properly dispersed, or there’s no confinement—the explosive chain reaction cannot occur. The other options include irrelevant properties (like humidity, temperature, viscosity, pH) or omit essential factors such as dispersion or confinement.