Please stop embarrassing yourself. Experienced traders are telling you how an exchange measures trade volume.  Listen to them.

All they do is measure buys and sells. Every time there is a trade volume is added. Even if the same coins are being bought and sold. Trade volume is simply swaps.
[/quot  so what your saying is  if i have a 100 coins sell 25 to you  the volume as gone up to 125  then you sell 12 and the volume goes up 137