Like
most materials, the material glass expands when it gets warmer. When
you place your thick glass in hot water, the outside of the glass gets
hot right away. Glass is not good at transferring heat, so the inside of
the glass gets hot later. Due to the
thickness of the glass it takes some time until the warmth has reached
the inner layer of the thick glass. This uneven distribution of warmth
causes the outer layer of your glass to expand first. Because the inner
layer is not yet warm and does not expand yet, a strong tension is being grated within the glass layer. And if you're unlucky, your glass
cracks because of that!
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