Discussion
Consider the following statements about the reversal temperature.
1. It marks where the sign of graupel charging changes.
2. Its value depends on the liquid water content present.
3. It is a single fixed temperature in all conditions.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct. Statement 3 is the simplification the second corrects: the reversal is not a single temperature but a boundary in temperature and liquid water content together, so a storm with a richer supply of supercooled water reverses at a colder temperature and places its negative centre higher. Quoting minus 15 degrees is a useful approximation rather than a physical constant.
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