I can crush a can or lift a boat, yet I am invisible. What am I?

Category: Science · Difficulty: hard

Hint: Consider the force exerted by the weight of the atmosphere.

Answer

Atmospheric Pressure

Explanation

Air pressure is the force exerted by the weight of air, capable of both crushing and lifting.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Atmospheric Pressure.

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