Hello, are you asking why the glass of the health pot is cracked by cold and hot water? It is caused by thermal expansion and cold contraction.

If the glass pot is filled with cold water and poured with boiling hot water, the inner wall will expand rapidly due to heat expansion and cold contraction, while the health pot is made of glass, so it will crack.

Health pot refers to a small household appliance that can cook various ingredients for the purpose of health care, similar to an electric kettle.