code: def flow_rate(vol_per_rev, rpm):
      
      return (vol_per_rev * rpm).to(u.mL/u.s)
docs: Return the flow rate from a pump given the volume of fluid pumped per
      revolution and the desired pump speed.
  
      :param vol_per_rev: Volume of fluid output per revolution (dependent on pump and tubing)
      :type vol_per_rev: float
      :param rpm: Desired pump speed in revolutions per minute
      :type rpm: float
  
      :return: Flow rate of the pump (mL/s)
      :rtype: float
  
      :Examples:
  
      >>> from aguaclara.research.peristaltic_pump import flow_rate
      >>> from aguaclara.core.units import unit_registry as u
      >>> flow_rate(3*u.mL/u.rev, 5*u.rev/u.min)
      <Quantity(0.25, 'milliliter / second')>