Question

why thick glass tumber cracks, when boiling water is poured in it?

Answer 1

Answer:

Sorry buddy I don't know the answer

Answer 2

Answer:

When boiling water is poured into a thick tumbler its inner surface expands. However, due to low thermal conductivity of glass, the expansion of outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks.

i hope this helps you