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An outlet or hole where a hydrogen fuel cell car expels its water from, just like how the actual private part how it will expel pee from the body. By the way, Hydrogen cars release water as a byproduct of the chemical reaction that occurs in their fuel cells. In a hydrogen fuel cell, hydrogen gas (H₂) combines with oxygen (O₂) from the air. This reaction produces electricity to power the vehicle and generates water (H₂O) as a byproduct.
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