Which side of the pick head axe is used for breaking glass?

The flat side of the pick head axe is specifically designed for breaking glass. This side is broader and provides a stable surface area to distribute the force applied when striking, thus making it effective for shattering glass surfaces, such as windows, during rescue or firefighting operations. The design takes advantage of the increased contact area, which enhances the likelihood of creating a clean break in glass while minimizing the risk of ricochet, ensuring safety for the operator and bystanders.

In contrast, the pointed side and the sharp edge serve different purposes in a firefighting context, such as puncturing materials or cutting through obstacles, which are not as effective for breaking glass. As for the idea that any side will work, while some might achieve a break, it is not reliable or safe, hence the preference for using the flat side for this specific task.