Advertisements
Advertisements
Question
Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
Solution
We can move our hand easily in air because the force of attraction between the particles of air is very small, as there are large inter-molecular spaces in air. However, we can’t move our hand through a plank of wood because the force of attraction between the particles of wood, which is a solid substance, is very strong and the inter-molecular spaces are negligible. That is the reason why we can’t move our hand through a plank of wood and need a karate expert to do so.
APPEARS IN
RELATED QUESTIONS
Give reason:
A red ink drop added to small amount of water in a glass turns water red in some time.
Fill in the blank:
..............can flow
Fill in the blank:
The physical state of a substance, which has a fixed volume but no fixed shape is .........
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly.
Give two examples of the following:
Substances which do not change their states.
Fill in the following blank with suitable words :
The smell of perfume gradually spreads across a room due to .....................
What is meant by 'diffusion'? Give one example of diffusion in gases.
In which of the three states of matter – solids, liquids, or gases is the movement of atoms about their own position. Give a reason for the same.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During soldification, the inter-particle space __________ gently.
Among the following ______ is not a mixture.
