On 06/09/2011 02:12 AM, Alain wrote:

> If you slowly heat very pure water, it can bet a good bit warmer that
> 100°C before it start to boil. There will be vapour escaping from the
> surface, but no ebulition, even in a open container. It's a dangerous
> situation, as any disturbance can cause explosive ebulition projecting
> scalding water everywhere.

Legend has it that boiling water in a microwave oven has this effect. I 
don't know of an authoritative source which can confirm or refute that...

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