Qn: The density blocks are made of different materials but they have the same volume. How do you determine which block has the largest density?
Ans: Density is mass/volume and their volume are the same, so the larger the mass, the larger the density. Measure the mass of the blocks, the block with the largest mass will have the largest density.
Density Qn: All the rods on the right have the same mass. Which rod has the smallest density? Ans: The longest rod has the smallest density. Density = mass / volume, since mass is constant, density will be inversely proportional to density. Hence, the smallest density rod will have the largest volume (longest rod).
Density Qn : The density of Olive oil is 0.92 g/cm 3 . What is the volume of 500 g of Olive oil? Ans: Volume = mass / density = 500 / 0.92 = 544 cm 3 Qn: The mass of an empty beaker is 110 g. The total mass of the beaker is 158 g when 50 cm 3 of a liquid is poured into it. What is the density of the liquid? Ans: Density = mass / volume = (158 – 110) / 50 = 48/50 = 0.96 g/cm 3
Density Qn : A room is 4 m long, 2.5 m wide and 2 m high. If the density of air in the room is 1.3 kg/m 3 , what is the mass of air in the room? Ans: Mass = density x volume = 1.3 x (4 x 2.5 x 2) = 26 kg
When 2 liquids of different densities are poured into the same container, the denser one will sink and the less dense liquid will float.
When a solid is placed in a liquid, it will float if its density is lower than the liquid’s density, and it will sink if it is denser than the liquid.
Density Qn: Why is the woman able to float in the dead sea effortlessly? Ans: The density of dead sea is very high (due to its high salt content) and human body is less dense than the dead sea hence she is able to float in the dead sea. Floating in dead sea