At present, there is 13.6kg of mercury. If a bottle with a volume of 0.2L is used, several bottles (P (instead of the symbol of density) of mercury = 13.6 ×

From the formula P = m / V, M = PV = 13.6 × 10 & sup3; the negative third power of × 0.2 × 10 = 2.72kg,
Number of bottles needed = 13.6kg/2.72kg = 5

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