Factor affecting viscosity

Answer 1

1. Temperature: Viscosity generally decreases as temperature increases, as the movement of molecules increases with higher temperatures.

2. Pressure: Viscosity typically increases with pressure, as greater pressure causes molecules to be packed more closely together, resulting in higher resistance to flow.

3. Composition: The type and size of molecules in a substance can greatly affect its viscosity. Larger molecules or molecules with longer chains tend to have higher viscosities.

4. Concentration: The concentration of a substance can also affect its viscosity, with higher concentrations typically resulting in higher viscosities.

5. Shear rate: Viscosity can change depending on how quickly a substance is sheared or the rate at which it is flowing. Some substances have non-Newtonian behavior, meaning their viscosity can change depending on shear rate.

6. Molecular weight: Higher molecular weight substances tend to have higher viscosities due to increased molecular interactions.

7. Shape and size of particles: The shape and size of particles in a substance can affect how easily they slide past each other, influencing the overall viscosity. Smoother, smaller particles typically result in lower viscosity.