(1) As can be seen from the figure, when the mass of substance A is 2g, its volume is 1cm3, ρ A =m A V A =2g 1cm3=2g/cm3,

(2) When the mass of substance B is 1g, the volume is 2cm3, ρ B =m B V B = 1g2cm3=0.5g/cm3,

Therefore, ρ a >ρb.

(2) Because the density of B is less than that of water, if it is put into enough water, it will float;

So the answer is: >; float