How to judge whether the glass is made of glass

1、 Touch the body of the cup to judge the difference between the two
In physical principle, the thermal conductivity of crystal is stronger than that of glass. When you touch the crystal cup with your hand, it will feel cold, while the glass is relatively mild.

2、 Knock the body of the cup to judge the difference between the two
Gently tap the body of the crystal cup or flick it with your fingers, the crystal cup will emit a light and sweet wind bell sound, and ripples in the air with a beautiful aftertaste, while the knocking sound of the ordinary glass is mostly very dull, with a “click, click” sound. There is no pleasant sound from the crystal cup, and there is no aftertaste.

3、 There are also obvious differences in hardness between the two
Industry insiders all know that the hardness of crystal is much stronger than that of glass. The hardness of crystal is 7, and the hardness of glass is 5. The crystal can break the glass, and the crystal is not easy to break, and the glass will break when it falls to the ground.

4、 Observe the transmittance and refractive index of the two to judge the difference between them
Lift a crystal cup, rotate it against the light, and carefully observe it, you will find it is like a beautiful handicraft, white and transparent, reflecting the colorful light effect. Crystals can also absorb luster, even ultraviolet rays, while ordinary glasses have no gloss or refractive index.