A thick glass tumbler often cracks when boiling water is poured into it.Why ?
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generally polling boiling water into the glass the thick glass is more likely to bust the glass because the glass is called when the hot water is poured the inner world expense rapidly due to heat expansion and contraction but the outer worlds remain the same which can cause the glass to exploit the shutter....
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This is because the inside of the glass expands suddenly but the outside does not, as glass does not conduct heat easily. If a steel spoon is placed inside the tumbler, it absorbs the heat when hot water is poured into it and prevents the glass from cracking.
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