Generally speaking, the compressive capacity and impact capacity of glass are relatively low, and it is very easy to break, and it is sharp after breaking. Moreover, due to insufficient hardness, obvious scratches will be left after being scratched by sharp objects, but the flatness of glass is relatively high and there will be no radian.
Ordinary glass basically has low compressive capacity and impact capacity, so it is very easy to break, and it will be very sharp after breaking. If you don't pay attention, you will cut your hand, and most of the glass are very straight and won't bend.
In addition, if you want to identify glass and other objects, you can use sharp objects to scratch hard on the edge. If it is easy to scratch, it means that it is glass, not hard materials such as tempered glass or diamonds.
Moreover, the flatness of glass is not comparable to that of other articles. It basically does not appear obvious radian and looks very straight and flat. If there is a slight radian or the side is not straight enough, it means that it is not a real glass.