Formation of condensation

Condensation is formed when humidity in the air settles on cold surfaces under certain climatic circumstances. The warmer the air, the more humidity it can absorb. Should the air cool down (for example on the window pane) it cannot retain the humidity. The superfluous humidity settles as condensation. When the pane is heated, the water evaporates and apparently disappears. In fact it is still present, albeit invisible, as vapour in the heated air.

An example

At a temperature of 20°C, air can absorb up to 17,4 g/m3 later. In this case one speaks of a saturation of 100%. However this value is rarely reached. At 20°C and a relative humidity of 60%, the air can still retain 10,44 g/m3 water. If this air meets with a window pane with a surface temperature of 11°C, it cannot retain the humidity any more since in this case it is 100% satutrated at a temperature of 11°C. Thus condensation is formed.

Condensation in windows

Acrylic is an organic material which absorbs water in molecular form. This means that water can penetrate the pane and raise the humidity in the double-glazing area. If the external temperature drops, the air between the two panes cools down. The superfluous humidity settles on the coldest side, that is, on the inner side of the outer pane.

Measures

An effective way to get rid of condensation is to ventilate the interior of the vehicle in order to reduce the humidity. Humidity is influenced by the air circulation. One could also raise the interior temperature. When cold air is heated up, it can thus absorb vapour. Therefore your window is not defective should there be condensation between the two panes. However you should have a little patience until the condensation disappears completely.