Discussion
Arrange the causal chain of a hot spot developing in a store:
1. A pocket of damp or damaged grain respires more rapidly
2. Local heat and moisture accumulate
3. Moulds and insects multiply in the warm damp pocket
4. The spot spreads and the bulk begins to cake
Select the correct sequence.
Answer: D
Correct answer: 1, 2, 3, 4
The chain begins with a local anomaly: a pocket of damp or damaged grain respires more rapidly than the surrounding bulk (1). Because grain is a poor conductor and the interstitial air moves slowly, the heat and moisture that respiration produces accumulate locally rather than dispersing (2).
The warm damp pocket is then ideal for moulds and insects, which multiply and respire in their turn (3) - a positive feedback. The spot grows, and the moisture and mould growth cause the grain to cake into a solid mass (4). Temperature probes exist to catch the sequence at step 2.
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