On Thu, 06 Dec 2007 19:29:19 -0600, cavelamb himself
wrote:

Richard Casady wrote:

On Thu, 06 Dec 2007 18:32:10 -0600, cavelamb himself
wrote:


Richard Casady wrote:

On Wed, 5 Dec 2007 07:41:59 -0500, "Sal's Dad"
wrote:



as 1/8 aluminum weighs about the same as 3/4
ply.


If you divide 2.7, the density of aluminum, by 6, you get .45. I
thought plywood was heavier than that.

Casady


plywood floats.

Aluminum don't.

What am I missing here?


A clue.

Casady


I thought most aluminum alloys weighed in at .1 pound per cubic inch.
Except 6061 which is only .09 lbs/cu.in.

Ply was .025 to .033 lbs/cu.in.

So clue me in.

I simply questioned if aluminum was in fact exactly six times as dense
as plywood. That is what you get with sheets six times as thick
weighing the same. That would make the density of plywood .017.lb/cu.
According to you it isn't. I simply opined that most plywood does not
have that particular density. What don't you understand? And I am
sorry about the cheap shot. It isn't really my style. I have the
'calculator that takes no prisoners',HP-48, and it isn't a problem but
it is usual to express wood density as pounds per cubic foot, in the
US, at least. Density figures in general are usually with reference to
the density of water.

Casady