Siti placed two identical mirrors, Mirror A and Mirror B, in a warm bathroom after a hot shower. She wiped Mirror B so that it was completely dry, but left Mirror A wet. Which mirror will form more "fog" (water droplets)?
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Worked Solution
Step 1: "Fog" on a mirror is caused by condensation of warm water vapour onto a cooler surface.
Step 2: For condensation to happen effectively, the warm water vapour needs to come into contact with the cooler surface of the mirror.
Step 3: Mirror B provides a dry, cool surface for the water vapour to lose heat and condense.
Correct answer: Mirror B
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