This is a good question but it doesn't have a simple answer. It can be explained through my theory. Unfortunately I don't have time to answer this question for you. Sorry. Moreover, until you understood my theory my explanation would be indecipherable to you anyway. And so, if you read and study "Lookout for Bill" you may eventually be able to answer this question for yourself.Maol wrote:How do you purport the sublimation of H2O at -40 degrees?
Here are some guidelines that might help:
First, understand what ice is and how/why ice crystals form and persist.
Secondly, understand why/how being below the surface tends to block factors that prevent or undo formation of ice crystals.
Lastly, understand how being on the surface these factors are not blocked.
More than anything else, you need to first understand that pendulumic aspect of liquid H2O that is associated with H2O's high heat capacity. This is thoroughly explicated in "lookout For Bill." Frankly, until you understand H2O's high heat capacity and the quantum mechanical factors that underlie it you won't really understand my theory. And until you understand my theory you won't be able to explain any of H2O's numerous anomalies, including sublimation.
James McGinn / Solving Tornadoes