What exactly is mass density?

[jelston]

My mass density is 170/32.2 lbf = (approx) 5.27 lbf/ft^3

Starting from the bottom up "lbf" is a unit of force. Why would it be involved in "mass density"


Also, in "english" units (inch, lbs, etc) the numerical value of your weight and your mass are practically the same on earth:


W= m*g/gc. SO m = W*gc/g


your m = (170 lbf)*((32.2lbm*ft^3)/(lbf*s^2))/(32.2 ft/s^2)


and it's real nifty; e'rthang but '170' and 'lbm' cancels so your mass is 170 lbm unless you cut something off.
Edited by: jelston

 

[jelston]

My most humble apologies to everyone that claimed weight density is a unit,Fluid Mechanics uses weight density, (I actually saw this studying for the FE).And hey if you want mass density to be true go for it. I'm wasting toomuch time on this topic. It's Friday night and I am here posting.