1. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
QUESTION 1 :
Explain how does the temperature of water affect the volume of bubble?
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

2. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
QUESTION 2
How does hard water produce less bubble then soft water?
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

3. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
QUESTION 3
Explain how can bubbles be made under water without taking air down with you?
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

4. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
Experienced
M/Having knowledge.
A/In polls,the voter said they want experienced nominees to run for president.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

5. Happened M/Occurs or takes place.
Lesson PLan
Happened
M/Occurs or takes place.
A/Something remarkable has happened in last few years.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

6. Why does balloon expand when heated?
Lesson PLan
Why does balloon expand when heated?
Initially, the gas (air) molecules inside and outside the bottle are at the same temperature.
When the bottle is heated, the air molecules inside start moving faster.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges
Gajwani Schools and Colleges

7. Why does balloon expand when heated?
Lesson PLan
Why does balloon expand when heated? :
These molecules now collide into the balloon with more energy resulting in increased pressure.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges
Gajwani Schools and Colleges

8. S8S1SCCH1-Air-pressure-Day3
Lesson PLan
Why does balloon expand when heated?
L1:
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

9. Lesson PLan
Hot Air Rise
A given amount (mass) of air takes up more space when it is hot. In other words, hot air is less dense than cold air.
Any substance that is less dense than the fluid (gas or liquid) of its surroundings will float.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

10. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
Hot Air Rise :
So, just as wood floats because it is less than water, hot air floats on cold air because it is less dense. This how hot air balloons get their lift.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

11. Air-pressure can crush
Lesson PLan
Air-pressure can crush :
Before heating,the can was filled with water and air.By boiling the water,the water changed states from a liquid to a gas.
This gas is called water vapor.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

12. Air-pressure can crush
Lesson PLan
Air-pressure can crush :
The water vapor pushed the air that was originally inside the can out into the atmosphere
When the ca was turned upside down and placed in the water, the water vapour condensed and turned back into the water.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

13. Air-pressure can crush
Lesson PLan
Air-pressure can crush :
All of the water vapor that filled up the inside of the can turned into only a drop or two of liquid, which took up much less space.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

14. Air-pressure can crush
Lesson PLan
This small amount of water cannot exert much pressure on the inside walls of the can, so the pressure of the air pushing from the outside of the can is great enough to crush it.
Air-pressure can crush :
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

15. Air-pressure can crush
Lesson PLan
Air-pressure can crush
Gajwani Schools and Colleges

16. Inflated P…In-flat-ed M..Filled or expanded by.
Lesson PLan
Inflated
P…In-flat-ed
M..Filled or expanded by.
A..By contract,healthy lungs appear pinkish and inflated.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

17. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
Maintained
P/Main-tai-ned
M/To keep up or carry on
A/Critics have maintained that the experiments were cruel and unnecessary.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

18. Explain why hot balloon rise?
Lesson PLan
QUESTION 1 :
Explain why hot balloon rise?
Ans..Hot air balloon rises because hot air is lighter then cold air and other gases.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

19. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
QUESTION 2
Explain giving scientific reason why we are not crushed through there is great pressure of air in our surrounding?
Ans..Because the pressure of air inside
the body and outside is equal.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

20. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
QUESTION 3 :
Note down the examples of work which are done by air-pressure?and explain any one?
Ans..Eg; 1.Cycle pump water gun syringe etc.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges