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
Theoretical Results In the particular machine case, several theoretical results are identified or can be derived: (a) If each operation can be scheduled such that everyone

What are wall footings? Explain in short. Generally wall footings are required to support direct concentric loads. However, an exception is the wall footings for retaining wall

Q. Design Wellheads and Wellpads? Hydrocarbon-producing wellheads and wellpads shall be located in open, well ventilated areas with as much segregation from other critical equi

What is the sequence of this problem Job- 1 2 3 4 5 6 7 M/c M1 4 13 16 7 11 12 10 M2 9 11 11 7 13 2 4

#A spherical aluminum vessel has an inside diameter of 30 cm and contains water at 80 ?C, with a quality of 1%. The vessel is then heated until the water inside is saturated vapor.

These parts of joints are used to connect two rods, which are under compressive or tensile stress. The ends of the rods are in the manner of a socket and shaft that fit together an

Projection Welding Projection welding is similar to spot welding but for the fact that the welding takes place at the projections on the surface of the metals and flat shaped e

which material is used in production of solid revits

(a) What is the function of fuel feed system? (b) What are the functions of a carburettor? (c) List main components of a carburettor. (d) Describe the working principle of

Copper And Its Production Copper is marked via a host of good engineering properties. The foremost is copper's good electrical conductivity and bulk of copper is utilized as e