Activity 14.3 class 9 science Ncert textbook
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"""As per the activity, the following are rational answers to the questions.
1. The air inside the bottle seemed to have become ‘foggy’ after it had been left outside in the sun for ten minutes and smoke from a lighted incense stick enters it.
2. The fog disappears when you press the bottle hardly between your hands and then leave it for a few seconds.
3. Pressure is higher when the bottle is crushed.
4. The fog is observed when the pressure is high.
5. The smoke acts as a center for the water and helps in the formation of water droplets.
6. If the same activity is done without an incense stick, the water droplets will not be as big as they were previously.""
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When the air inside the bottle is saturated with water vapour and the smoke of the incense stick is inserted in it.The smoke particles acts as a nucleus for the water vapours and thus cloud formation takes place.
1) When the bottle is released.
2)When these droplets will become heavier they will come down as a water and thus fog will disappear.
3)When pressure is high it causes
condensed droplets to come down thus disappearing fog.
4) The fog is observed inside the bottle if the pressure inside the bottle is low. 5)They act as nucleus around which water droplets are formed 6) Particles of water will not be visible as
bigger droplets will be hard to form.
Explanation:
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