In some contexts, the term "pound" is used almost exclusively to refer to the unit of force and not the unit of mass. In those applications, the preferred unit of mass is the slug, i.e. lbf*s^2/ft. In other contexts, the unit "pound" refers to a unit of mass. In circumstances where there may otherwise be ambiguity, the symbols "lbf" and "lbm" and the terms "pounds-force" and "pounds-mass" can be used to distinguish.
Gav wrote:Although, I wouldn't guess the feathers would be "considerably lighter." Probably more like 0.999 pounds. Someone want to figure it out?
Javelin wrote:Sure! How tightly packed are the feathers?
Gav wrote:Javelin wrote:Sure! How tightly packed are the feathers?
In fact, I think there isn't a difference in weight in either case. The "buoyancy" is caused by the total displacement of air, and adding air doesn't displace any more air. Like, if you had a bunch of ping pong balls in water, their total buoyancy wouldn't be affected by if they were closely packed and glued together in one big hunk, or in BCC form, or into a huge hollow (water-filled) sphere.
So I think all you need is the feathers' density without air. Am I thinking about this right?
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