VW Golf manuals

Volkswagen Golf Service & Repair Manual: Pressure and boiling point

The boiling points given in the table below are always based on an atmospheric pressure of 1 bar. If the pressure on a liquid is changed, its boiling point changes also.
It is well known that, for example, the lower the pressure, the lower the temperature at which water boils.
The vapour pressure curves for water and for refrigerant R134a show that at constant pressure and falling temperature the vapour becomes liquid (in the condenser), and that when pressure drops, the refrigerant changes from liquid into the vapour state (evaporator).
   
Vapour pressure curve for water
A -  Liquid
B -  Gaseous
C -  Vapour pressure curve for water
1 -  Pressure on the liquid in bar (absolute)
2 -  Temperature in °C
 

Pressure and boiling point

Vapour pressure curve for refrigerant R134a
A -  Liquid
B -  Gaseous
D -  Vapour pressure curve for refrigerant R134a
1 -  Pressure on the liquid in bar (absolute)
2 -  Temperature in °C
 

Pressure and boiling point

Heat always flows from warmer to colder material
Every material consists of a mass of moving molecules. The fast moving molecules of a warmer material loose part of their energy to slower molecules possessing less heat. This slows down the molec ...

Vapour pressure table for refrigerant R134a
The vapour pressure table for each refrigerant is published in the literature for refrigeration engineers. This table shows the vapour pressure exerted on the liquid ...

Other materials:

2-pack HS Optimum clear coat
Designation: 2-pack HS Optimum clear coat -LZK 769 K02 A5- Issued 10.2012 Product description 2-pack HS Optimum clear coat is a VOC compliant (VOC content < 420 g/l), high ...

Removing and installing rear centre three-point seat belt
Removing –  Remove backrest cover with backrest padding from rear seat backrest → Chapter.     –  Unscrew nut -1-. –  ...

Wax-based underseal -D 316 000 A1
Designation: Wax-based underseal -D 316 000 A1- Issued 01.2008 Product description Wax underseal -D 316 000 A1- offers excellent long-term underbody corrosion protection. ...

© 2016-2025 Copyright www.vwgolf.org