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what are difference between 存在 & 在? both of them meaning "exist" please

PS:sorry,i type it below comment
存在emphasis on feeling,where as 在 emphasis on location.
即使她站在对面，我感觉不到她的存在
even we stand face to face,i can't feel her exist。
means that her mind is not on me ,the first 在 means location,and the second 存在 means feeling

存在means "being ,existence "in english
for example
1. i can't feel your stay 我感觉不到你的存在（in this sentence "存在"is noun )
2. oxygen is present in the air,氧气存在于空气中（in this sentence "存在"is verb )
i hope i can help you

存在 & 在
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存在=there be=有

你问的这个词不存在（ the word that you ask is not exist)

你在吗？are you online=你在线吗？【when you are in skype, you can send 你在吗 or 你在线吗 to a friend 】

我在学习 I am studying

我在房间里 I am in the room

我在回家的路上 I am on the way home