One property of glass is that it does not pass electricity.
But it glass is heated,it will pass elecricity.
Glass should not pass electricity though it is amazing!
If you quickly cool heated glass with water,it cracks and cracks finely just by applying a little force. The reason is that the glass could not bear to stretch due to temperature difference The other is that when glass powders are put in a phenolphthalein solution the glass turns red.