I think the confusion on this topic arises because physics classes are always going to be taught in metric. I also don't like that 90% of the time lbs are used in placed of lbf, so you generally end up assuming that pounds = pound force, and that assumption kind of erks me. Water Systems Unit Converter Temperature o C K o F. Common converting units for Acceleration, Area, Density, Energy, Energy per unit mass, Force, Heat flow rate, Heat flux, Heat generation per unit volume and many more.

The magnitude of the units for lbf and lbm being the same for g = 32.2 ft/s2 leads to viewing mass and force as being interchangeable in imperial units, but mass and force are completely different things, same as they are in the metric system. Imperial (USCS) and SI dimensions and units terminology in fluid mechanics. I personally just wish slugs were always used for mass in place of lbm, because I prefer that clarity of an obvious distinction between mass and force.

You've got the right idea, but are confusing lbm for slugs.ĭensity of water in slugs/ft3 = (62.4 lbf) / (32.2 ft/s2) = 1.94 slugs/ft3 The specific gravity SG is the ratio of the fluids density to that of water at standard conditions, for water the value of SG equals 1. Yeah, this is something I dislike in imperial units.

Density of water in imperial units