10 APPENDIX
LACO Technologies
TITAN VERSA Operations and Maintenance Manual
169
Figure 15:
Absolute vs. Relative Conversions
10.1.2.1.
Rules of Thumb
•
Torr = 75% of Mbar
•
1000 millitorr = 1 Torr
•
1000 millibar = 1 bar
•
1 bar = 1 atmosphere
•
Millitorr = Micron
•
1 psi = 2" Hg
•
25 torr = 25 mm Hg = 1" Hg
•
mm Hg = Torr
Elevation vs. Vacuum Level
Elevation (ft.)
Max. Relative Vacuum (in Hg) Percent Loss
0 (sea level)
29.92
0
1,000
28.85
3.6
2,000
27.82
7.0
3,000
26.82
10.4
4,000
25.84
13.6
5,000
24.89
16.8
6,000
23.98
19.9
7,000
23.06
22.9
8,000
22.20
25.7
9,000
21.38
28.5
10,000
20.58
31.2
Vacuum
Local Atmospheric Pressure
Local Atmospheric
Pressure - Relative
Units 0 psig
0" Hg
Standard Atmospheric Pressure (sea level)
Standard Atmospheric Pressure - Absolute Units
1 atm
14.7 psia
760 torr
1013 mbar
Gauge
(relative)
pressure
Absolute
pressure
Gauge
(relative)
pressure
Absolute
pressure
Pressure