Flowbench Math

Based on Work by Peter Burgess and Stan Weiss - see below for revisions

Test Piece Diameter (mm)
Reading on Test Piece Manometer (mm H2O)
Reading on Orifice Manometer (mm H2O)
Ambient Temperature (deg C)
Barometer Reading (mBar)
Hygrometer Reading (%)
Orifice Diameter (mm)
Flow Bench Variable
The airflow is c.f.m. at 25 inches H2O.
The airflow is c.f.m. at 10 inches H2O.
The airflow is c.f.m. at 15 inches H2O.
The airflow is c.f.m. at 28 inches H2O.
The coefficient of discharge is

Revision #1 (April 16, 2014) - see https://www.pistonheads.com/gassing/topic.asp?t=1397626

Revision #2 (October 17, 2018) - Vapour pressure is calculated from ambient temperature