The volume of the hollow aluminum ball is 30cm3, the mass is 27g, and the total mass is 43g after filling with a certain liquid?

The volume of the hollow aluminum ball is 30cm3, the mass is 27g, and the total mass is 43g after filling with a certain liquid?

(1) 7 × 103kg / m3 = 2.7g/cm3, from ρ = MV, the volume of 27g aluminum: V aluminum = m ρ aluminum = 27g2.7g/cm3 = 10cm3, the volume of hollow part: V air = V ball-v aluminum = 30cm3-10cm3 = 20cm3; (2) the mass of liquid filled: m liquid = m total '- M = 43g-27g = 16g, the volume of liquid: