Monday, 21 May 2012

How does Sound proof and Bullet proof glasses works?

Sound proof glass uses several separate layers of glass. These layers make it difficult to another. Some of the sound get reflected when it passes through a surface and experiences a change in speed.

Sound travels much more slowly in air than in glass. When sound passes in on out of a glass pane, most of the sound is reflected backward. If two rooms are separated by three or four sheets of glass, and each of these glasses are carefully sealed into place such that there are no holes through which sound can be leaked, then a very small amount of sound can make it through the overall window and most of the sound will get reflected back.

A bulletproof glass is a multilayered sandwich of glass and plastic. It is like the front windshield of a car but having many more layers. When a bullet hits the surface of this sandwich, it starts to tear into the layers. However, before the bullet manages to burrow all the way through to the final layers, the bullet loses momentum. The bullet’s energy and momentum are transferred to the layers of glass and plastic and hence it leaves the one inside the bullet proof glass with no harm.

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