V=20 м3 Ф=0.6 (60%) poн=7,3*10^-3 кг/м3 m=?
Ф=po/poн*100% po=Ф*poн m=po*V=Ф*poн*V=0.6*7.3*10^-3*20=87.6*10^-3 кг (87,6 г)
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V=20 м3 Ф=0.6 (60%) poн=7,3*10^-3 кг/м3 m=?
Ф=po/poн*100% po=Ф*poн m=po*V=Ф*poн*V=0.6*7.3*10^-3*20=87.6*10^-3 кг (87,6 г)
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