What are fluids?

Explain why it is easier to cut an apple with a sharp knife than with a blunt knife.

The figure shows a container filled with a liquid of density $\rho$. Four points $A, B, C$ and $D$ lie on the diametrically opposite points of a circle as shown. Points $A$ and $C$ lie on a vertical line,and points $B$ and $D$ lie on a horizontal line. Which of the following statements is incorrect? (Here,$p_A, p_B, p_C, p_D$ are the absolute pressures at the respective points.)

Is pressure a scalar or a vector quantity? Explain.

Explain the specific density or relative density of a substance.

Three liquids of densities $d, 2d$,and $3d$ are mixed in equal volumes. Then the density of the mixture is