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# DASSAULT: SOLIDWORKS Simulation/FEA FAQ

## Cosmos/M

 Howto calculate density in the IPS system by kellnerp faq1183-1760 Posted: 23 Jan 12 (1)    P = ρghso for water in the IPS system:       ρ = 62.4 lbm/ft3 / (1,728 in3/ft3) / 386.16 lbm/slinch = 0.000094 slinch†/in3where:(2)    F=ma    so    F/m=32.18 ft/s2*12 in/ft = 386.16 lb/slinchwhich gives, for a one inch water column in an inertial frame on the earth's surface:       0.001122 slinch/in3 * 386.16 in/s2 = 0.0361 lb/in2which is about what you would expect. †    "slinch" is a slang word for the mass unit in the IPS system since there is no formal word for mass in this system. Note:    People brought up in the English system confuse force with mass, while many people brought up in the metric system confuse mass with force, eg, torque wrenches calibrated in kg-m. Nobody said the Imperial (IPS) units were easy. Back to DASSAULT: SOLIDWORKS Simulation/FEA FAQ Index Back to DASSAULT: SOLIDWORKS Simulation/FEA Forum

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