RussellMc wrote:
>> And what would be the density if filling with sand and then pouring
>> water to fill the voids?
>
> That's an interesting question with an "obvious" but (arguably)
> counterintuitive answer.
>
> Density will RISE when lower density material is added ;-).
>
> This is because sand density is calculated with air void mass included
> in calculation.
> ie the material sand is made from has a higher density than sand, but
> when it is ground up, density drops due to low desity air being added.
>
> The obviousness of this can be seen in the observation "wet sand is
> heavier than dry sand" (for equal volumes).
>
> For an N% void volume you'll get ABOUT N/2% mass increase.
>
> So if 10% void % you'll get 5% mass increase.
> Memory suggests the ratio is typically higher.

Also a system of wet sand particles may fall into developing more
dense structure than system of dry particles, kind of "quicksand"
effect.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.