HOTS Science Primary 4 Energy

Steam from a kettle is invisible, but a white mist is seen further from the spout. Which statement correctly explains this?

A The invisible steam loses heat to the cooler air and condenses into water droplets.
B The steam reacts with oxygen to form clouds.
C The mist is steam that has expanded.
D The mist is water vapour that has gained heat.
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Worked Solution

Step 1: Steam (water vapour) is an invisible gas. Step 2: As it moves away, it encounters cooler air and loses heat. Step 3: This results in condensation into tiny visible liquid droplets (mist).

Correct answer: The invisible steam loses heat to the cooler air and condenses into water droplets.

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