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Message: <blockquote data-quote="LokiDR" data-source="post: 993985" data-attributes="member: 6239">You are both saying it is heat transfer, but Pielorinho seems to think it has nothing to so with water perminating the surface where MarauderX thinks that is the key.There is a way to solve this problem.  Make a container of a non-insulating, non-water-permiable material that melts/burns at a low temperature.  Thin plastic or lead would be good options.You will find, I think, that materials other than paper will spout holes and leak long before the water boils away.  The heat transfer only works in the paper cub because the water is right at the surface of the material.  The water then soaks up the heat/evaportates.  If the water isn't in the material (non permiable) the heat transfer will not be fast enough for the water to take all the heat and prevent the container from melting.</blockquote>