The best replacement for pressure drop is flow.

The best alternatives to pressure drop are rated as following:
★★★★★  flow
★★★★★  flow rate
★★★  viscosity
★★  pipe diameter
★  pressure loss
★  reynolds number
★  superficial velocity
★  back pressure
★  head loss
★  flow relationship
★  mass flow rate
  length pipe
  pipe size
  gpm
  air flow
  leak rate
  air flow rate
  pipe length
  air velocity
  differential pressure

Your alternative for pressure drop is not listed? Suggest!
Speaking about pressure drop, one probably shouldn't forget about flow rate.

Other search terms related to pressure drop and their ratings are:
★★★★★ flow rate
★★★★ friction factor
You have in mind a companion for pressure drop and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pressure drop in all years. Click on graph for more.
pressure drop
flow
flow rate