I am a gas that can make you cry, yet I aid in your breath. What am I?

Category: Science · Difficulty: expert

Hint: Think about what you inhale and the reactions it can cause.

Answer

Oxygen

Explanation

Oxygen is essential for respiration but can lead to tears when it reacts with certain chemicals.

This is a expert science riddle — one of the harder riddles here. The answer is Oxygen.

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