Charge Factor

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2016 Audi A4, 2015 Audi S4, and 2015 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

A container must have space for vapor as well as liquid. As the temperature rises, the liquid expands. The space filled with vapor decreases. At a certain point, there will only be liquid in the container. Beyond this, even a slight increase in temperature causes high pressure to build up in the container as the liquid tries to continue expanding even though there is not enough space for it. The forces that result are strong enough to rupture the container. To prevent a container from being overfilled, the regulations regarding compresses gasses specify how many kilograms of refrigerant that may be added to a container per liter of interior volume. The product of multiplying this charge factor by the internal volume of the container is the permissible capacity. The figure for refrigerant used in vehicles is 1.15 kg / liter.