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Volkswagen Polo Service & Repair Manual: Refrigerant R134a Vapor Pressure Table

The vapor pressure table for every refrigerant is published in literature for refrigeration system engineers. This table makes it possible to determine the vapor pressure acting on the column of liquid in a vessel if the temperature of the vessel is known.
Because each refrigerant has its own characteristic vapor pressure table, refrigerant can be identified by measuring the pressure and temperature.
  Note
At absolute pressure, 0 bar/psi corresponds to absolute vacuum. Normal ambient pressure (positive pressure) corresponds to 1 bar (14.5 psi) absolute pressure. 0 pressure corresponds to an absolute pressure of 1 bar (14.5 psi) on most pressure gauges (indicated by -1 bar (-14.5 psi) below 0 bar/psi).
   
Temperature in °C (°F) Pressure in bar (psi) of R134a
-45 (-49) -0.61 (-8.84)
-40 (-40) -0.49 (-7.10)
-35 (-31) -0.34 (-4.93)
-30 (-22) -0.16 (-2.32)
-25 (-13) 0.06 (0.87)
-20 (-4) 0.32 (4.64)
-15 (5) 0.63 (9.13)
-10 (14) 1.00 (14.5)
-5 (23) 1.43 (20.74)
0 (32) 1.92 (27.84)
5 (41) 2.49 (36.11)
10 (50) 3.13 (45.39)
15 (59) 3.90 (56.56)
20 (68) 4.70 (68.16)
25 (77) 5.63 (81.65)
30 (86) 6.70 (97.17)
35 (95) 7.83 (113.56)
40 (104) 9.10 (131.98)
45 (113) 10.54 (152.86)
50 (122) 12.11 (175.64)
55 (131) 13.83 (200.58)
60 (140) 15.72 (227.99)
65 (149) 17.79 (258.02)
70 (158) 20.05 (290.80)
75 (167) 22.52 (326.62)
80 (176) 25.21 (365.64)
85 (185) 28.14 (408.13)
90 (194) 31.34 (454.54)
Pressure and Boiling Point
The boiling point given in tables for a liquid is always referenced to an atmospheric pressure of 1 bar (14.5 psi). If the pressure acting on a fluid changes, its boi ...

Refrigerant R134a
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