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:

Two-Part HS Vario Clear Coat
Definition: Two-Part HS Vario Clear Coat -L2K 769 K01 A5- Edition 06/2013 Product Description Two-part HS vario clear coat is a VOC compliant (VOC value less than 420 g/L), h ...

Light Alloy Wheels, Preparing
  WARNING Do not repair damaged rims by heating, welding or adding or removing material. Do not repair damaged or deformed rims or rims with cracked or deformed bolt h ...

Introduction
This chapter contains information on the following subjects:  → Warning and indicator lamps    → Handbrake    → Parking    → Information on the brakes    → Brake support systems    → Switching the TCS on and off    → Brake flu ...

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