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CONVERSION FACTORS AND TABLES
°F-32
Temperature: °C =
___________
; °F = (1.8 x °C) + 32
1.8
Pressure measurement: mm = 0.03937 in in = 25.4 mm
cm = 0.3937 in in = 2.54 cm
m = 39.37 in in = 2.54 x 10
–2
m
f force
p =
___________
= pressure =
___________
m
2
surface
According to the international system, pressure measurement is expressed in Pascal 1 Pa = 1 N/m
2
=
1 Newton/square metre.
The principal engineering units for measuring pressure are:
Pascal = Pa (N/m
2
), kPa = 10
3
Pa, Mpa = 10
6
Pa
Bar = bar, mbar = bar x 10
–3
Metres of column of water 4°C = mH
2
O, mmH
2
O = mH
2
O x 10
–3
Millimetres of column of mercury 0°C = mmHg, Torr
Theoretic atmosphere = at (kp/cm
2
)
Physical atmosphere = atm
Inches of column of water at 4°C = in H
2
O
Inches of column of mercury at 0°C = in Hg
Micro of column of mercury at 0°C = µm Hg
Pounds per square inch = psi
1 bar = 100,000 Pa Pa = 10
–5
x bar
1 bar = 14.5038307 psi psi = 0.0689473023 x bar
1 bar = 0.986923 atm atm = 1.01325 x bar
1 bar = 755.7299444 mmHg mmHg = 0.001323224 x bar
1 bar = 10.19716213 mH
2
OmH
2
O = 0.0980665 x bar
psi = in of H
2
O x (3.6127 x 10
–2
) in of H
2
O = psi x 27.68
psi = mm of H
2
O x (1.4223 x 10
–3
) mm of H
2
O = psi x 703.1
psi = cm of H
2
O x (1.4223 x 10
–3
) cm of H
2
O = psi x 70.3
psi = in of Hg x 0.49118 in of Hg = psi x 2.036
psi = mm of Hg x (1.9339 x 10
–2
) mm of Hg = psi x 51.71
psi = Kg/cm
2
x 14.223 Kg/cm
2
= psi x 0.0703
psi = bar x 14.503 bar = psi x 0.0689
psi = mbar x (1.4503 x 10
–2
) mbar = psi x 68.95
ENGLISH
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