1. Why does the bicycle tube burst if excess of air is filled in it?
Lesson PLan
QUESTION 1
Why does the bicycle tube burst if excess of air is filled in it?
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
Where do you use air pressure in your day-to-day life? Give four example?
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
Give four names of devices working on air-pressure? explain any one of them?
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

4. Immerse B/Im-merse P/ Im-merse
Lesson PLan
Immerse
B/Im-merse
P/ Im-merse
M/Involve oneself deeply in a particular activity.
A/In cellular networks, adjacent cell cannot use the same radio frequency.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

5. SUCKING M/Draw fluid from(something) into the mouth by suction.
Lesson PLan
SUCKING
Suck-ing
M/Draw fluid from(something) into the mouth by suction.
A/It seems to me mosquito release a liquid to facilitate sucking the blood.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

6. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
What makes up bubble?
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

7. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
What makes up bubble?
Bubbles are generally made of soapy water that has been formed into a thin film. 
The film traps air in the center, causing the bubble to retain its spherical shape until it pops.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

8. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
What makes up bubble?
The reason why bubbles only really hold their shape when made with soapy water is that the soap stabilizers the surface of the bubbles.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

9. STD 8, SUB science, CH-1, Air-pressure, DAY-1
Lesson PLan
What makes up bubble?
The soap decrease the bubbles surface tension, which allows it to stretch and hold its shape.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

10. Why do bubbles have colour?
Lesson PLan
Why do bubbles have colour? :
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

11. Why do bubbles have colour?
Lesson PLan
Why do bubbles have colour?
Bubbles have colour same as rainbow.
We can see the colours in a bubble through the reflection and refraction of light waves off the inner and outer surfaces of the bubble wall.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

12. Lesson PLan
Why do bubbles have colour?
You can’t colour a bubble since its wall is only a few millionths of an inch thick.
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

13. Lesson PLan
Why air produce whistling sound? :
When the water in a teapot heats up,the air pressure inside the teapot expands and has to be released so the air rushes out the spout,creating a whistling sound..
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges

14. 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

15. 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

16. 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

17. 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

18. 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

19. TOMORROW Be ready to discuss the
Lesson PLan
TOMORROW
Read the next few pages of in the chapter
Be ready to discuss the
Why hot air rise?
END OF TODAY’S WORK
STD 8, SUB science, CH-1, Air-pressure, DAY-1
Gajwani Schools and Colleges