Pressure and Vacuum
 

P = Pressure (lbs/in2, newtons/m2, dynes/cm2)

F = Force (lbs, Newton’s, dynes)

A = Area (in2, m2, cm2)

P = Pressure (lbs/in2, newtons/m2, dynes/cm2)

r = the density of the fluid

h = the vertical height of the fluid

g = gravitational acceleration

P = Dh

P = Pressure (lbs/in2)

D = the weight density (lbs/in3)

h = the vertical height of the fluid

 

Image204.gif (1938 bytes)

PT = true pressure

M = mass

r a = density of air

r b = density of brass

gL = local gravitational acceleration
gS = standard gravitational acceleration

Ao = area of piston

b = pressure coefficient

P = nominal pressure

a k = coefficient of thermal expansion of piston

a c = coefficient of thermal expansion of cylinder

t1 = reference temperature

t2 = ambient temperature

Pressure Conversion Chart

To
From

Psi

in H2O

ft H2O

in HG

ATM

gm/cm2

kg/cm2

cm H2O

mm HG

1 Psi

 

27.66

2.307

2.036

0.06805

70.31

0.07031

70.31

51.72

1 in H2O (4C)

0.03612

 

0.08333

0.07355

0.002458

2.540

0.002450

2.540

1.868

1 ft H2O (4C)

0.4335

12.00

 

0.8826

0.02950

30.45

0.03048

30.48

22.42

1 in HG (0C)

0.49116

13.60

1.133

 

0.03342

34.53

0.03453

34.53

25.40

1 ATM

14.696

406.8

33.90

29.92

 

1033

1.033

1033

760

1 gm/cm2

0.01422

0.3937

0.03281

0.02896

0.0009678

 

0.0010

1.000

0.7356

1 km/cm2

14.22

393.7

32.81

28.96

0.9678

1000

 

1000

735.6111

1 cm H2O (4C)

0.01422

0.3937

0.03281

0.02896

0.0009678

1.000

0.0010

 

0.7355

1 mm HG (0C)

0.01934

0.5353

0.04461

0.03937

0.001316

1.360

0.001360

0.001360

 

Find the pressure unit you desire to convert from in the first left column. Follow the selected
top row across to the corresponding unit you desire to convert to. Multiply the two numbers.

Pressure Conversions

from 1 to 15 digits

From

To     

Conversion Factor

Value

Units Value Units Multiply by

Click on From Value blank, type Value and select From and To Units.

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