mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm . . . The following relationship is key to understand the link between lbm and lbf: 1 lbf=32 174 lbm ft s^2 Arm yourself with this knowledge so that you can fight the good fight: the next time you hear someone say that pound-mass and pound-force are the same thing, you can confidently say they are not!
Barometer Column with Mercury - Engineering Stack Exchange Olin's method yields the correct answer, but a dimensional analysis of the pressure number shows it using lbf I barely understand how to go between lbf and lbm mass anyway, the only consistent way I get the right answer is by converting everything to metric and then back Thus I conclude that Imperial units are stupid
pound force and pound mass - Engineering Stack Exchange I have a question about work measured in foot-pound Let's say we have a 10 pound-mass ($10$ $\\text{lb}_m$) object Then since that 10 pound-mass ($10$ $\\text{lb}_m$) object gives 10 pound-force ($
Mass and weight of air in a room - Engineering Stack Exchange A pound force is defined as the force required to accelerate a slug at 1 ft s^2 The density of air is $\rho = 0 0724 \ lb_m ft^3 = 0 0724 32 2 \ slugs ft^3$ The weight of the air is $\rho V g = 0 0724 32 2 \ slugs ft^3 \cdot32 2 ft s^2\cdot 6000 ft^3 = 0 0724\cdot 6000 \ slugs\ ft s^2 = 434 4 lb_f$
Thermodynamics - heat exchanger - Engineering Stack Exchange A thin walled double pipe counter flow heat exchanger is to be used to cool oil (Cp = 2198 J kg°K) from 150°C to 40°C at a rate of 2 27kg s by water (Cp = 4187 J kg°K) that enters at 21°C at a rate
Unit Conversion for Mass Density - Engineering Stack Exchange I am doing a Finite Element analysis of a continuum In my problem definition I use these units: mm for length, kPa for applied stress, and MPa for material stifness (Young's modulus) With these