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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
Vapor Pressures of Water
Temperature Observed
Absolute Pressure
on Vacuum Indicator
Inches of Mercury
F
C
"Hg
kPa Hg
70
17.8
.739
2.496
60
15.6
.522
1.763
55
12.8
.436
1.472
50
10.0
.363
1.226
45
7.2
.300
1.013
40
4.4
.248
0.837
35
1.7
.204
0.689
32
0
.180
0.608
NOTE: To determine vacuum in inches of mercury, subtract absolute pressure from
barometer reading.
(b) Handle the vacuum indicator with care. It must be vacuum tight to give a true reading. The top
seal of the indicator is not designed to support a long run of connecting tubing. Fasten tubing to supports to
prevent damage.
4-867
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