Q:

How do you break a window with a spark plug?

A:

Quick Answer

In order to break a car window's tempered glass, the porcelain insulator inside of a spark plug can be used. Unglazed porcelain is rated 7 on the Mohs scale of mineral harness, while glass is rated 5.5.

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Full Answer

To shatter a car window with a spark plug:

  1. Obtain the spark plug's insulator
  2. Spark plugs generally use a porcelain insulator. Break the spark plug with a hammer to obtain the porcelain insulator inside of the spark plug.

  3. Shatter the window
  4. Throw a piece of porcelain at the car's window to break it. The small pieces of porcelain can easily break a window when they are thrown at it.

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