Atmospheric pressure and gauge pressure - thermodynamics, Mechanical Engineering

Atmospheric Pressure (Patm):

It is pressure exerted by atmospheric air on any surface. It can be measured by a barometer. The standard values of it are;

1 Patm = 760 mm of Hg that is column or height of mercury

=   .g.h. = 13.6 × 103  × 9.81 × 760/1000

= 101.325 kN/m2  = 101.325 kPa

= 1.01325 bar

when density of mercury is taken as 13.595 kg/m3  and acceleration because of gravity as 9.8066 m/s2

Gauge Pressure (Pgauge):

It is the pressure of fluid contained in closed vessel. It is always greater than atmospheric pressure. It is measured by an instrument called as pressure gauge (like Bourden's pressure gauge). The gauge measures pressure of fluid (liquid and gas) flowing through pipe or duct, boiler etc. irrespective of atmospheric pressure.

 

Posted Date: 10/15/2012 1:16:07 AM | Location : United States







Related Discussions:- Atmospheric pressure and gauge pressure - thermodynamics, Assignment Help, Ask Question on Atmospheric pressure and gauge pressure - thermodynamics, Get Answer, Expert's Help, Atmospheric pressure and gauge pressure - thermodynamics Discussions

Write discussion on Atmospheric pressure and gauge pressure - thermodynamics
Your posts are moderated
Related Questions
Explain Milling Fixture? A milling fixture is a work holding device which is firmly clamped to the table of milling machine. It holds the work piece in correct position as

Parallelogram law of forces: The law of parallelogram is used to determine the resultant of two forces acting at the point of a rigid body in plane and is inclined to each o

Cantilever beam - shear force diagrams: Illustrate the shear force & bending moment diagrams for the cantilever beam illustrated in Figure. Figure Solution

Explain the Automation in Machining? The word "automatic" is derived from Greek and it means "self-moving or "self thinking". The word "automation" has been used to refer to a


Need a basic explanation of how to go about doing a plane strain analysis of a pressure vessel

Heat Treatment of Cast Iron: Castings in iron are frequently heat treated for enhancing mechanical properties and microstructure. The treatments known to cast iron are explai

Illustarte the following (a) Acceptance sampling (b) OC-Curve

how to culculate stress in unsymmetrical bending

Determines the effect of price reduction: In order to enhance the sales, management of Quality ice-cream company decided to give discounts in the sale of one and half liter pa