The density of body in medium is proportional to the acting tension acting on that body. Density of water-Density of air ∝Twater−Tair Similarly, Density of liquid-Density of water ∝Tliquid−Twater From, the given values. Twater−Tair=Tliquid−Twater Substitute the values in above expression. 1000kg∕m3−1kg∕m3=Tliquid−1000kg∕m3 Tliquid=2000kg∕m3