"if(Touch )" statement in Unity script? Is it Possible?!

Questions & Answers
1

I only know how to sense collision with:

if(col.gameObject.tag=="b1")

but how do I sense when the two objects are “Touching” each other?

2

You can override the OnCollisionStay function of a MonoBehaviour to get updates on objects that remain touching the object for more than a frame if that is what you’re looking for.