Vacuum pressure and absolute pressure - thermodynamics, Mechanical Engineering

Assignment Help:

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


Related Discussions:- Vacuum pressure and absolute pressure - thermodynamics

Explain the principle of screw conveyer, Explain the Principle of screw con...

Explain the Principle of screw conveyer When materials are feed into the fixed chutes, due to action of gravity of materials and the friction force between material and chute t

What are combined footings, What are combined footings? COMBINED FOOTIN...

What are combined footings? COMBINED FOOTINGS: When a footing supports two or more columns in the same line, it is called a combined footing. The combined footing which supp

Balsa wood truss car design, design a car to be build by balsa wood trusses...

design a car to be build by balsa wood trusses, the car has to be with in a specific dimension, calculations of forces on members and nodes using method of joints need to be done a

Define pattern draft or taper, Q. Define Pattern draft or taper? It is ...

Q. Define Pattern draft or taper? It is also termed as "draw". It is the taper placed on the pattern surface that are parallel to the direction in which the pattern is withdraw

What are the demerits and merits of sliding mesh gear box, (a ) What are th...

(a ) What are the demerits and merits of sliding mesh gear box? (b) Show a four speed gear box, including reverse speed for a passenger car and illustrate how the speed ratio is

Define properties of system, Define Properties of System For defining a...

Define Properties of System For defining any type of system particular parameters are required. Properties are those observable characteristics of the system, which can be util

Stresses., temparature stresses in composite bars

temparature stresses in composite bars

Vented causeway, Vented Causeway: Vented causeways are structures pro...

Vented Causeway: Vented causeways are structures provided with vents (usually pipes) to take care of dry weather perennial flows and which allow water to overflow the paved b

Manufacturing process for reinforced plastic parts, Manufacturing Process F...

Manufacturing Process For Reinforced Plastic Parts Two processes that are open mould and close mould are commonly utilized for manufacture of reinforced parts. Hand layup proce

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd