Vacuum pressure and absolute pressure - thermodynamics, Mechanical Engineering

Vacuum (Or Vacuum pressure) (Pvacc):

It is pressure of fluid, which is always less than atmospheric pressure. Pressure in a steam condenser is one such example. It can be measured by a pressure gauge but the gauge reads on negative side of atmospheric pressure on dial. The vacuum signifies difference between absolute pressure and atmospheric pressures.

Absolute Pressure (P abs):

It is pressure of fluid, which is measured with respect to the absolute zero pressure as the reference.

Absolute zero pressure can occur only if molecular momentum is zero, and this condition occurs when there is perfect vacuum. Absolute pressure of fluid can be more or less than atmospheric depending upon, whether gauge pressure is expressed as absolute pressure or vacuum pressure.

Inter relation between various types of pressure representations. It is shown in Figure given, which can be expressed as follows.

pabs = patm  + pgauge

pabs = patm  - pvace

330_Vacuum pressure and absolute pressure.png

Posted Date: 10/15/2012 1:18:55 AM | Location : United States







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

Write discussion on Vacuum pressure and absolute pressure - thermodynamics
Your posts are moderated
Related Questions
Research on Best air pressure :             Once we had green light to go on with sand blasting process. We had conducted a few experiment testing and analysis. First of all we

Cellulosic Electrodes In the AWS E 6010 and E 6011 series of electrodes, the protective covering is composed of cellulose (C6H10O5) and silicate binders. The cellulose decomposes

A steel plate with dimension shown in sketch (a) below is subjected to P = 150 kN tensile force and M= 300 N-m bending moment. The plate is made of AISI 1080 steel. A hole is to be

Give important wage incentive plans for direct workers. Give advantages and limitations of each plan. a) Standard time for a given job is 15 hours and hourly rate of wages is 50

Present and talk about the bearing, a typical mechanical element for friction decreasing. Complete Table  Q2 about benefits,disadvantages and examples of applications of the follow


A rectangular plate has two holes of dimensions shown and is released from the position shown. The plate is hinged about a horizontal axis and can rotate in the vertical plane. An

Q. Identification of Defects of coating? All holidays and other coating defects, including without limitation primer blister, excess powder mounds, crazed coating, lifted and u

Applications of seam welding Lap seam welding is used for the manufacture of cans, buckets and water tanks and for welding thin walled large diameter pipes. Mash seam welding

what desaster made chemistry