I can be hot or cold, yet I sit in the middle. My state depends on pressure, but I'm not a riddle. What am I, in this thermal fiddle?
Category: Science · Difficulty: hard
Hint: I am essential for life, found in three different states.
Answer
Liquid H2O
Explanation
Water can exist as a solid, liquid, or gas, depending on temperature and pressure.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Liquid H2O.
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