Absolute and gage pressure
3.1 Pressure = force/area; p = F/A
3.2 Absolute pressure is measured relative to a perfect vacuum.
3.8 False. Absolute pressure cannot be negative because a perfect vacuum is the reference for
absolute pressure and a perfect vacuum is the lowest possible pressure.
3.14 pgage = 583 103 = 480 kPa(gage)
3.15 pgage = 157 101 = 56 kPa(gage)
CHAPTER THREE
PRESSURE MEASUREMENT
Pressure Measurement
21
Pressure Measurement
23
Pressure Measurement
25
3.94
h
3.95
w
hh
3.96
m
m
hh
3.97
hsg
wc
3.98
hsg
wsw
3.99
w
hh
Pressure Measurement
27
3.100
2
in
lb
0.036
in
12
ft 1
in
12
ft 1
in 1
ft
lb
62.4h
22
22
3
w
3.101
kPa 105m 0.790
m
kN
9.81013.54hsgP
3
wm790mm
3.102
(g)
lb
4.33
ft 1
ft 10
lb
62.4h
22