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1st year Plumbing math > Pressure & Atmosphere > Flashcards

Flashcards in Pressure & Atmosphere Deck (13)
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1

Formula for Force

F=Pressure x Area

2

Pressure and force units

Psi-lb/in2
Psf-lb/ft2
oz/in2,
Pa,
kPa

3

Six principles of hydrostatic

-Fluid pressure exerted in all direction
-shape of the container does not affect Floyd pressure
-fluid pressure is proportional to depth
-fluid pressure is proportional to density
-horizontal runs do not increase pressure
-volume of fluid does not affect pressure

4

Water one meter high exerts a pressure of

9.81 kPa

5

Mercury one meter high exerts a pressure of

133.416 kPa

9.81 kPa (weight of 1m of H2O) x 13.6 (RD of mercury)

6

Two factors that affect pressure

Height and density of the fluid

7

What factor doesn't affect pressure

Volume of fluid

8

One cubic foot of water column exerts a force of 62.4 lb. divided by pressure of 144 in2 (inches in a foot) equals

0.433 psi lb/in2

Height in feet

9

One in2 column of water weighs 0.0361 lb. How much does a 12" water column exert for pressure

0.433 psi

10

one sq. in. weighs 0.0361 lb. times 16oz/lb equals

0.578 oz/in2

Height in inches

11

INCHES OF MERCURY

RD of mercury is 13.6 times 0.0361 psi equals

0.491 lb/in2
Mercury

12

1 sq meter base 1 meter high water column of water has the pressure of

9.81 kPa
Kilopascals

13

Find the weight of one sq inch of water column
0.433 psi divided by 12 equals

0.0361 lb/in2