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प्रश्न
What are the forces of cohesion and adhesion?
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उत्तर
The force of attraction between the molecules of a similar kind is called a force of cohesion.
Example: The attraction between water molecules, keeping a water droplet together.
The force of attraction between different types of molecules is called a force of adhesion.
Example: The attraction between water and a glass surface, causing water to stick to the glass.
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संबंधित प्रश्न
Give two examples for the following :
Substances which do not change their states.
Give two examples for the following :
Substances that are rigid and not compressible.
Which of the following is a property of the liquids?
The molecules of each substance are identical.
Select the correct alternative
The diameter of a molecule is approximately
Match the following columns
| Column A | Column B | ||
| A. | A molecule is composed of | i. | does not exist free in nature. |
| B. | Ice, water and water vapour | ii. | can vibrate only up to about `10^-10`m from their mean position. |
| C. | An atom | iii. | atoms. |
| D. | Gases | iv. | are the three states of water. |
| E. | The molecules of a solid | v. | occupy space |
Describe a simple experiment to illustrate the existence of inter-molecular spacing.
State the approximate spacing between two molecules of a matter.
Write your observation and conclusion for the following:
When a small stone is gently dipped into a glass filled with water.
Write true or false for the statement. Rewrite the false statement correctly.
Solids and liquids can flow.
