VW Polo manuals

Volkswagen Polo Service & Repair Manual: Physical Principles

The four known states of water also apply to air conditioning system refrigerants.
1 -  gaseous (invisible)
2 -  vapor
3 -  fluid
4 -  solid
 

Physical Principles

When water is heated in a vessel (heat absorption), water vapor can be seen to rise. If the vapor is further heated through heat absorption, the visible vapor turns into invisible gas. The process is reversible. The warmth is extracted from gaseous water, vapor forms first, then water and then ice.
A -  Heat absorption
B -  Heat emission
 

Physical Principles

Heat Transfer

Every substance consists of a mass of moving molecules. The fast moving molecules of a warmer substance give off some of their energy to the cooler and thus slower molecules. As a result, the molecular motion of the warmer substance slows down and that of the colder substance is accelerated. This process continues until the molecules of both substances are moving at the same speed. They are then at the same temperature and no further heat exchange takes place.
   
A/C Technology Basic Principles
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Pressure and Boiling Point
The boiling point given in tables for a liquid is always referenced to an atmospheric pressure of 1 bar (14.5 psi). If the pressure acting on a fluid changes, its boi ...

Other materials:

Introduction
This chapter contains information on the following subjects:  → Warning lamp  → Childproof lock Additional information and warnings: Exterior views Vehicle key set Central locking system Manual opening and closing WARNING Any door that is not properly ...

Warning lamp
First read and observe the introductory information and safety warnings Lit up Possible cause Solution At least one vehicle door is opened or not properly closed. Do not drive on! Open the appropriate vehicle door and then c ...

Two-Part Wash Primer
Definition: Two-Part Wash Primer -LHV 043 000 A2- Edition 10/2010 Product Description The two-part wash primer is a zinc chromate-free, phenol-free and acid-free two-componen ...

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