Standard Science Primary 4 Energy

A glass flask filled to the brim with coloured water is placed in a bowl of very hot water. What will be the FIRST observation?

A The water will boil immediately.
B The water level will drop slightly, then rise.
C The water level will immediately rise.
D The water level will remain the same.
Show Worked Solution

Worked Solution

Step 1: The glass flask gains heat first and expands, increasing its volume. Step 2: This causes the water level to drop slightly. Step 3: As the water inside gains heat, it expands more than the glass, causing the level to rise above the original mark.

Correct answer: The water level will drop slightly, then rise.

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