Discussion
A cloud condenses 100 units of water and delivers 30 to the ground. Its precipitation efficiency is
Answer: A
Correct answer: 30 per cent
\[ \frac{30}{100} = 30\ \mathrm{per\ cent}. \] The remaining seventy per cent is re-evaporated, detrained into the surrounding air, or left as cloud that never falls. Efficiencies of this order are normal, and they are why the water actually condensed in a cloud is a poor guide to the rain it will produce.
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