pressure pascal s principle l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Pressure; Pascal’s Principle PowerPoint Presentation
Download Presentation
Pressure; Pascal’s Principle

Loading in 2 Seconds...

play fullscreen
1 / 19

Pressure; Pascal’s Principle - PowerPoint PPT Presentation


  • 124 Views
  • Uploaded on

Pressure; Pascal’s Principle. PRESSURE OF A FLUID. pressure = height of mercury column . air pressure. Barometer. Gauge pressure – pressure above the atmospheric pressure. absolute (total) pressure = gauge pressure + atmospheric press. Pressure is produced by the

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Pressure; Pascal’s Principle' - charlie


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
pressure of a fluid
PRESSURE OF A FLUID

pressure = height of mercury

column

air pressure

Barometer

slide3

Gauge pressure – pressure

above the atmospheric pressure.

absolute (total) pressure =

gauge pressure + atmospheric press.

slide5

Pressure is produced by the

weight of the fluid above the

surface.

slide6

force

pressure = ------

area

weight of fluid

= ----------------

area

mg

= -----

area

density · volume · g

= -------------------------

area

density · (area · height) · g

= --------------------------------

area

slide7

pressure = density · height · g

P = ρhg gauge pressure

P = ρhg + P0 absolute pressure

SI units:

pressure: N/m2 = Pascals (Pa)

density: kg/m3

height (depth): m

slide8

Standard atmospheric pressure

760 mm Hg ≈ 30 in Hg

Calculate 1 atm in Pascals

P = ρgh

ρHg = 13.6 x 103 kg/m3

g = 9.8 N/kg h = 0.760 m

P = 1.013 x 105 Pa

slide9

Why does a barometer use mercury

and not water?

If p = 1 atmosphere = 1.013 x 105 Pa

ρ = 1.00 g/cm3 = 1.00 x 103 kg/m3

Find height.

10.3 m

slide11

Pressure does not depend on volume,

only on height (depth).

“Water seeks its own level”

slide14

Pascal’s Principle – The pressure

in an enclosed fluid is constant

throughout the fluid.

p1 = p2

F1 F2

--- = ---

A1 A2

slide15

1 N

?

A = 1 cm2

A = 50 cm2

p1 = p2

1 N F2

------- = ------

1 cm2 50 cm2

50 N

slide16

If piston on left moves 10 cm,

what distance does piston on right

move?

work1 = work2

F1 d1 = F2 d2

(1) (10) = (50) d2

0.2 cm

slide18

Area of brake cylinder > area of brake line

force of brake cylinder > force of brake pedal