What is viscosity in physical chemistry?
Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.
What is viscosity of a liquid?
Viscosity is the resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow.
What is the physical significance of viscosity in fluid?
Significance of Viscosity: It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction. A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion.
What physical mechanism changes the viscosity of liquids?
Both cohesion and molecular interchange contribute to liquid viscosity. The impact of increasing the temperature of a liquid is to reduce the cohesive forces while simultaneously increasing the rate of molecular interchange. The former effect causes a decrease in the shear stress while the latter causes it to increase.
What are 3 factors that affect viscosity?
Increase in temperature decreases viscosity. Increases in pressure increase viscosity in liquids. In water, it decreases whereas, in gases, it remains the same.
- Increase in temperature decreases viscosity.
- Increases in pressure increase viscosity in liquids. In water, it decreases whereas, in gases, it remains the same.
What are the main causes of a liquid viscosity?
Viscosity is caused by friction within a fluid. It is the result of intermolecular forces between particles within a fluid.
How does temperature affect viscosity of liquids?
Hydrodynamic Properties. The liquid viscosity is highly affected by the heat. The viscosity decreases with an increase in temperature.