Vacuum - Air Expansion Ratio

Convert vacuum air volume to standard air volume. Calculate the expanded air ratio (EAR) to convert SCFM (standard cubic feet per minute) to ACFM (actual cubic feet per minute) using absolute vacuum pressure and temperature.

Calculator

Inputs

Absolute Vacuum Pressure (inches Hg)

Temperature (°F)

Standard Air Volume Flow (SCFM) (SCFM)

Results

Expanded Air Ratio (EAR)-- ratio

Actual Air Volume Flow (ACFM)-- ACFM

Absolute Pressure (inches Hg)	Vacuum (%)	EAR at 60°F	EAR at 70°F	EAR at 80°F
29.92	0	1	1.02	1.03
22.44	25	1.33	1.36	1.38
14.96	50	2	2.04	2.07
7.48	75	4	4.08	4.15
0	100	∞	∞	∞