Patrick Elliott wrote:
> It does get wetter, just *outside* the range of displacement from the 
> pressure you apply to the sand. And, if you stand there long enough that 
> the grains can rearrange to be less compacted, you *will* end up with 
> your puddle.

Indeed, but that doesn't really explain why it dries out initially. 
Contrast it with stepping in wet mud for example, or on a wet carpet. 
(as far as I understand the phenomenon, by the way, I believe that your 
explanation of why the puddle eventually forms is incorrect).

Post a reply to this message