Class 9 SCI CH 1 - Session 1

2. Matter in Our
Surroundings

4. Effect of
Change of
Temperature

6. Solid to
liquid

7. Melting of
Icecream

9. Kinetic Energy of the
particles increases which
overcomes the forces of
attraction between the
particles

10. Melting
The process in which a
substance changes from
solid-state to the liquid state

11. Melting Point
The temperature at which a solid
melts to become a liquid at the
atmospheric pressure is called
its melting point.

12. Melting point of ice is
0°C

13. Solid Liquid
Gas

14. Liquid to
Gas

15. Vaporization
- Evaporation
- Boiling

16. Evaporation

17. Boiling

18. Boiling
The process in which a
substance changes from
liquid-state to the gaseous
state

19. Boiling Point
The temperature at which a
liquid boils to become a gas at
the atmospheric pressure is
called its boiling point.

20. Solid Liquid
Gas

21. Solid to
Gas

22. Sublimation
Process in which a substance
changes from solid-state to
the gaseous state.

23. Solid Liquid
Gas

24. Freezing
Process in which a substance
changes from liquid-state to
the solid state.

25. Condensation
Process in which a
substance changes from
gaseous-state to the
liquid state.

26. Deposition
Process in which a
substance changes from
gaseous-state to the
solid state.

28. Effect of Change of Pressure

29. When we apply pressure
on a gas enclosed in a
cylinder, it starts
compressing and
converts into liquid

31. Next Session
Evaporation