Discussion
Statement I: Plume rise is negligible for a hot combustion source.
Statement II: Buoyancy from the temperature difference between the gas and the ambient air lifts the plume.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Plume rise from a hot combustion source is far from negligible; it commonly adds tens or even hundreds of metres to the physical stack height, and since maximum ground level concentration falls roughly as \( 1/H^2 \), ignoring it would badly overestimate the impact.
Statement II is correct and is the reason: the exhaust is much hotter and hence less dense than the ambient air, so buoyancy accelerates it upward until mixing brings it to the surrounding temperature. Momentum from the exit velocity adds to this, but for a hot source buoyancy dominates.
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