Variation of Viscosity
The coefficient of viscosity depends on the following mentioned factors.
- Effect of Temperature on Viscosity: The viscosity of liquids decreases with an increase in temperature. The viscosity of gases increases with an increase in temperatures as η ∝ √T.
- Effect of Pressure on Viscosity: The coefficient of viscosity of liquids rises as pressure increases, although there is no relationship to explain the phenomenon thus far.
The table given below lists some fluids and their coefficient of viscosity at different temperatures:
Fluid |
Temperature (in °C) |
η (deca-poise) |
---|---|---|
Air |
20 |
0.018 × 10-3 |
Water |
0 |
1.8 × 10-3 |
20 |
1.0 × 10-3 |
|
Blood |
100 |
0.3 × 10-3 |
37 |
2.7 × 10-3 |
|
Engine Oil |
30 |
250 × 10-3 |
Glycerine |
0 |
10 |
20 |
1.5 |
What is Viscosity?
Viscosity is the measurement of the resistance of the flowing liquid. Let us learn more about viscosity with an example suppose we take two bowls, one bowl contains water and the other has honey in it, we drop the content of both bowls then we see that water flows much faster than honey which concludes that honey is more viscous than water.
Viscosity is the property of the liquids that prevents liquids from spreading. The force generated due to viscosity is called Viscous Force. Since this force is between the layers of liquids, it is also called internal friction. In this article, we will learn about viscosity its formula, measurement, and much more in detail.
Table of Content
- What is the Meaning of Viscosity?
- Viscosity Formula
- Types of Viscosity
- Measurement of Viscosity
- Applications of Viscosity