Riddle

The higher I climb, the hotter I engage, I can not escape my crystal cage. What am I?

Choose an answer

A.Water in a kettle
B.Steam in a pipe
C.A thermostat
D.Mercury in a thermometer.
Hint: It's a 4-word phrase with 21 letters, starting with "M".

Answer

Mercury in a thermometer.

Why this is the answer

As temperature rises, the mercury inside a glass thermometer climbs higher while remaining sealed inside the glass tube.

This riddle is filed under Planet Riddles and rated Medium.

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