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Tiny shards of spark plug porcelain have smallhard points which allow them to easily find a breaking pointin glass. They can also be used to break theside window of vehicles. Spark plug porcelain fragments aresometimes referred to as ninja rocks because of their ability tobreak glass with ease.
Moreover, can a piece of porcelain break glass?
When thrown with moderate speed at a side-window, asharp shard of the exceptionally hard aluminium oxide ceramic usedin spark plugs focuses the impact energy into a small enough areawithout blunting to initiate cracking, releasing the internalenergy and shattering the glass.
In this manner, can a spark plug break any glass?
A: Yes, a spark plug thrown at a car windowwill break it. So will a rock, a good-size ballbearing or a ball-peen hammer. The side widows are made oftempered glass that, while strong, can bebroken with a strong blow. The glass will thenshatter into cubes instead of shards so you are less likely to beseriously cut.
Accelerate a block of salt to .9999999999999c andaim it at the glass. It will probably breakthe glass, and the Earth at the same time. But really, Idon't really think just salt and saliva alone willbreak the glass.