👉 Impenetrability is a concept in physics that refers to the difficulty of penetrating or overcoming an obstacle. It describes how difficult it is for something to penetrate through a material, such as glass or steel, without causing significant damage or cracking. In other words, if you try to cut through a piece of metal with a sharp blade, it will not be easy because the metal is so tough and resistant to being sliced. Similarly, trying to crack a solid object like a rock or a concrete block