Suzuki: Water from silencer, cold beverage, water drops

Question
I have seen some times water drops from the exhaust pipe of  running car. Why please explain. I am from Pakistan.

Answer
Gasoline is a Hydrocarbon. (hydro-water carbon-carbon)
When it burns inside the engine one of the things it makes is water, usually in the form of water vapor.
Just as water can condense on a cold beverage glass, if there is any water vapor in the air, water vapor in the exhaust can condense on the inside of the exhaust when it is not yet hot, and thus you will occasionally see water drip from the exhaust.  When the air temperature is below 0 degrees C, sometimes the vapor will be seen as a cloud of white while the vehicle is warming up.