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The Inch-Pound-Second (IPS) System of Units

Description

 • The IPS system of units has the inch, pound, and second as its base units.  Unlike modern systems of units, composite dimensions are not necessarily represented by a product of powers of the base units. For example, the unit of power, the horsepower, is not equal to one square inch pound per cubic second.
 • When used in conjunction with the UseSystem command, the IPS system sets the following units for the given dimensions.

 Dimension Name Unit Name length inch mass pound time second acceleration inch/second^2 plane angle radian solid angle steradian area inch^2 torque poundforce*inch(radius) energy poundforce*inch force poundforce power horsepower speed inch/second volume inch^3 pressure poundforce/inch^2 thermodynamic_temperature degF currency dollar electric_potential volt luminous_flux lumen amount_of_substance mole magnetic_inductance henry magnetic_flux_density tesla illuminance lux electric_current ampere electric_charge coulomb magnetic_flux weber electric_conductance siemens logarithmic_gain decibel electric_resistance ohm electric_capacitance farad luminous_intensity candela

Examples

Notes:

 – To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select $\mathrm{unit}$ and then enter the unit.
 – When you edit a unit, double brackets appear around it.
 > $\mathrm{Units}\left[\mathrm{UseSystem}\right]\left('\mathrm{IPS}'\right)$
 > $\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Standard}\right]\right):$
 > $5\mathrm{Unit}\left(\frac{{'\mathrm{inch}'}^{2}'\mathrm{pound}'}{{'s'}^{2}}\right)$
 ${5}{}⟦\frac{{{\mathrm{in}}}^{{2}}{}{\mathrm{lb}}}{{{s}}^{{2}}}⟧$ (1)
 > $\mathrm{combine}\left(,'\mathrm{units}'\right)$
 $\frac{{2540}}{{196133}}{}⟦{\mathrm{lbf}}{}{\mathrm{in}}⟧$ (2)
 > $\frac{\mathrm{Unit}\left('s'\right)}{}$
 $\frac{{127}}{{64723890}}{}⟦{\mathrm{hp}}⟧$ (3)
 > $\frac{{\mathrm{Unit}\left('\mathrm{yard}'\right)}^{2}}{}$
 $\frac{{5}}{{1296}}{}⟦\frac{{\mathrm{lb}}}{{{s}}^{{3}}}⟧$ (4)