Lifehammer, also known as safety hammer, is an auxiliary escape tool installed in an enclosed cabin.It is generally installed in an accessible place in an enclosed compartment such as a car.In case of emergency such as fire or falling into water in closed cabins such as automobiles, it is convenient to take out and smash the glass windows and doors for smooth escape.The conical tip of the life hammer is mainly used. Because the contact area of the tip is very small, when the hammer is used to hit the glass, the pressure of this contact point on the glass is quite large (which is a bit similar to the principle of the thumbtack), and the car glass is slightly cracked due to a large external force at this point.As for tempered glass, a little crack means that the stress distribution inside the whole glass has been damaged, which leads to numerous spider web cracks in an instant. At this time, only a few more blows with a hammer can remove the glass fragments.
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