Is there really ammonia in pee?

My uncle who is without a doubt the most stubborn person on the planet insists that there is ammonia in pee. I’m sure most if not all adults have heard this once in their lifetime. But I was told in my science class by my teacher, a SCIENTIST, that ammonia is only in pee when it’s inside your body; once pee is... show more My uncle who is without a doubt the most stubborn person on the planet insists that there is ammonia in pee. I’m sure most if not all adults have heard this once in their lifetime. But I was told in my science class by my teacher, a SCIENTIST, that ammonia is only in pee when it’s inside your body; once pee is outside your body, ammonia is no longer there. My stubborn uncle who is not remotely a scientist wouldn’t believe me. Can other scientists back this up???
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