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半径rの球の体積は4πr³/3なので
雲粒の体積aはa=4π(0.01)³/3 =4/3･π×10⁻⁶ [mm³]
雨粒の体積bはb=4π(1)³/3=4/3･π [mm³]
b/a=10⁶=1000000
よって100万個
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