Volkswagen Polo Service & Repair Manual: Physical Principles
| The four known states of water also apply to air
conditioning system refrigerants. |
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| 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. |
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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. |
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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:
Side airbags
Fig. 59 On left-hand side of vehicle:
deployment zone of the side airbag (variant A). On the side of the front seat: location
and deployment range of the side airbag (variant B)
First read and observe the introductory information
and safety warnings
The side airbags are located in the outer ...
Severely Discharged Batteries, Charging with Battery Charger -VAS5900
Special tools and workshop equipment
required
Battery Charger -VAS5900-
WARNING
Risk of injury. Follow all Warnings and Safety
Precautions. Refer to
→ ...
Welding and Soldering on Refrigeration Systems
Before performing welding or soldering work on vehicles near
the air conditioning system components, extract the refrigerant
and remove the residue by flushing with compressed air and
nitrogen.
The products of refrigerant decomposition d ...
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Pressure and Boiling Point