What is the relation between the viscosities of blood and water?

The correct answer is Blood is more viscous than water.

Key Points

• Viscosity is a measure of resistance to flow which arises due to the internal friction between layers of fluid.
• This resistance to fluid motion is like internal friction analogous to friction when a solid moves on a surface.
• Strong intermolecular forces between molecules hold them together and resist the movement of layers past one another.

Additional Information

• The SI unit of viscosity is poiseiulle (Pl), named after the scientist Jean Louise Poiseuille.
• Its other units are N s m-2 or Pa s.
• The dimensions of viscosity are [ML-1T-1].
• 1 poise = 1 g cm–1s–1 = 10–1kg m–1s–1.
• The viscosity of liquids decreases with an increase in temperature while it increases in the case of gases.