Love...prove it

The air, you can not see,
But you can taste it, it has a smell;
Love is the same, I suppose,
Could you prove to someone that you have fell?

Time is something that exists,
But there is no tangible proof;
Feelings are similar, I guess,
But I believe the heart knows the truth.

The atomic structure of the universe is real,
But you can not witness that reality;
The invisible bonds of affection,
Is a strength of actuality.