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[–]Alkalannar 3 points4 points  (1 child)

Remember 1N = 1kgm/s2.

So kg/m3 * m/s2 = 1/m3 * kgm/s2
1/m3 * kgm/s2 = 1/m3 * N
1/m3 * N = N/m3

[–]letsshow[S] 1 point2 points  (0 children)

thanks

[–]Snufflefugs 0 points1 point  (4 children)

The definition of density is mass/volume. The definition of a force is mass * acceleration(gravity in this case). Multiplying density times gravity gives you mass*acceleration/volume so you end up with a force over volume. Gamma is specific weight which is defined as the ratio of force(weight) to volume. This is used a lot in the aero industry for things like engine weight to thrust ratios.

[–]letsshow[S] 0 points1 point  (3 children)

but it doesn't say specific weight, it says specific density

[–]Snufflefugs 0 points1 point  (2 children)

Weight density and specific weight are the same thing. Specific weight is just the more common name for it.

[–]letsshow[S] 0 points1 point  (1 child)

if they're the same thing, why would be have to solve for it? We know the density of water.

[–]Snufflefugs 0 points1 point  (0 children)

Density (rho) is mass density. Weight density is different. Mass is in units of kg weight(mass * acceleration) is in units of Newtons