Q.7 Observe the given images and identify the Phenomenon shown by the activity: a and b
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Explanation:
1st one it is because while keeping the bottle into the bucket it traps some air due to that when it is kept in water air pumps out and water go’s in
2nd one when the glass is kept upon candle it contains a little oxygen after a few seconds candle blows off because it needs oxygen to burn
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a ) Here ,cup upside down case -
The pressure of the air inside the cup and the air pressure outside the cup are equal.
Air enters into the cup, equalises the pressure, and gravity pushes the water out
b ) Phenomenon observed is
Oxygen is present in the air
Oxygen is essential for Combustion ( lighting of candle requires oxygen ) .
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