Question

Which of the following factor/factors can affect viscosity of a liquid?
1. temperature
2. pressure
3. nature of fluid
4. All of the above factors affect viscosity of fluid

Answer 1

Correct Answer - Option 4 : All of the above factors affect viscosity of fluid

CONCEPT:

• Viscosity: The state of being sticky, thick, and semi-fluid inconsistency, due to internal friction of fluids is called viscosity.
  • The viscosity of a material is affected by temperature, pressure, nature of fluid, velocity gradient  , etc.

  

EXPLANATION:

• The following factors affect viscosity:
• Temperature: Generally, the viscosity of a liquid decreases with an increase in temperature.
  • With an increase in temperature, the average speed of the molecules increases. So, the amount of time they spend "in contact" with their nearest neighbors decreases.
  • So With an increase in temperature, the average intermolecular forces decrease.
  • Thus the stickiness and thickness decrease and hence viscosity decreases.
  • Syrups and Honey can be made to flow more readily when heated.
• The viscosity of gases increases with an increase in temperature.
• Pressure: Viscosity is normally independent of pressure.
  • But when extreme pressure is applied the fluids often experience an increase in viscosity.
  • The extra pressure increases stickiness and thickness. So viscosity increases.
• Nature of fluids: Every fluid behaves in a different manner. So different fluids will have different viscosity.
• So the viscosity depends on all the given options.
• Hence the correct answer is option 4.