Advanced Science Primary 4 Energy

A balloon is stretched over the neck of a flask. When the flask is placed in a bowl of ice-cold water, the balloon deflates and is sucked into the flask. This is because __________.

A the air inside the flask lost heat and contracted
B the balloon gained heat and expanded
C the flask contracted and squeezed the air out
D the cold water entered the flask
Show Worked Solution

Worked Solution

Step 1: Ice-cold water causes the flask and the air inside to lose heat. Step [2-9]: Air is a gas and contracts significantly when it loses heat. Step [2-9]: The reduction in volume of air inside the flask creates lower pressure, causing the balloon to deflate.

Correct answer: the air inside the flask lost heat and contracted

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