Jump to content

bar vs. psi


Guest Anonymous
 Share

Recommended Posts

Guest Anonymous

The pressure of a system is defined as the force exerted by the system on unit area of its boundaries. This is the definition of the absolute pressure. Often in measurements a gauge is used to record the pressure difference between the system and the atmospheric pressure. This is called gauge pressure and can be stated by the following equation:

P=Pg+Po

P=absolute pressure,

Pg=gauge pressure,

Po=atmospheric pressure.

If the pressure of a system is below atmospheric, it is called vacuum pressure.The SI unit of pressure is pascal (Pa):

1 Pa=1 N/m

"bar" is used in many industrial applications:

1 bar=0.1 MPa

This unit is approximately equal to atmospheric pressure:

Standard atmospheric pressure=1.01325 bar= 101325 Pa

In hydraulic "m of water" is common:

1 m of water=9806.65 Pa

Many gauges use Mercury (Hg) as the measurement medium.

1 mmHg=133.4 Pa

Other units are:

dyn/cm=0.1 Pa

kgf/cm=kp/cm=at=98067 Pa

lbf/ft=47.879 Pa

in (H2O)=249.08 Pa

in (Hg)=3386.4 Pa

psi=lbf/in=6894.7 Pa

ksi=1000 psi=68.947 MPa

14.7/1.01325 = 14.507772

Cheers!

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Upcoming Events

×
×
  • Create New...