On Thu, 12 Jan 2006 10:51:22 GMT, "david lang"
wrote:

| Dave Fawthrop wrote:
| There is a standard way of breaking glass bottles cleanly to form a
| ?glass? using boiling water. So boiling water definitely breaks
| glass.
|
| It's the thermal shock that breaks the glass, not the temperature. One
| part expands much faster than another.
|
| Glass is made at something like 2000 centigrade after all

Glass is brittle as everyone who has broken a glass doing the washing up
knows. Expand one bit in relation to another and it goes ping.
--
Dave Fawthrop dave hyphenologist co uk
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