pm#force_measure__forcemeasure
  supertype:  pm#unit_of_measure_for_a_physical_process
  subtype:  #force_unit__forceunit  a unit of measurement of physical force
     subtype:  #dyne  a unit of force equal to the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 gram
     subtype:  #newton__N  a unit of force equal to the force that imparts an acceleration of 1 m/sec/sec to a mass of 1 kilogram; equal to 100,000 dynes
     subtype:  #sthene  a unit of force equal to 1000 newtons
     subtype:  #poundal__pdl  a unit of force equal to the force that imparts an acceleration of 1 foot/sec/sec to a mass of 1 pound; equal to 0.1382 newtons
     subtype:  #lbf.__pound  a nontechnical unit of force equal to the mass of 1 pound with an acceleration of free fall equal to 32 feet/sec/sec
     subtype:  #g__gee  a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated

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