English English Nederlands Nederlands Deutsch Deutsch Italiano Italiano Español Español Français Français 简体中文 简体中文 Português Português Русский Русский
    DetailingWiki Newsletter
    Get free and automatic updates on new articles
    We respect your privacy. No data is used for anything other than sending the newsletter!


What is condensation

Written by:

Condensation can affect how well you can look through the windscreen. It can be a nuisance that you might want to prevent or remove. Humidity is very relative and understanding this will help to handle, remove or prevent it.

What is condensation

Condensation is a side-effect of large difference in relative humidity. This occurs when the air isn’t capable anymore to hold the water vapour it absorbed.

For example: air with a temperature of 10 degrees Celsius can contain a certain amount of water vapour. If it contains 100% if what it can carry, the air is saturated and the relative humidity is 100%. Just for this example, we say that air with a temperature of 10 degrees Celsius can hold a maximum of 10 gram water vapour per cubic meter.
When air gets warmer, it can absorb more moisture. So hot air can contain more water vapour then cold air. In this example we’ll say that air with a temperature of 15 degrees Celsius can obtain a maximum of 15 grams of water vapour per cubic meter.
The air inside the car’s interior is 15 degrees, and is saturated. It holds 15 grams of water vapour per cubic meter. This saturated air comes in contact with the window, which is actually colder than the air. The glass of the windscreen will cool down quicker and more than the air in the car.
The thin layer of air that comes into contact with the windscreen cools down, but that means it holds more water vapour than it can carry. The colder air can only hold 10 gram, which is 5 gram less than it holds at the moment. This excess of water vapour needs to go somewhere. The vapour solidifies and shows as condensation on the glass.

To prevent this, the glass would have to be the same temperature (or higher) then the air inside the car. If that was the case, the air wouldn’t need to get rid of the excess water vapour and no condensation will occur.

Relative humidity and condensation

Humidity is a relative term, this means that the humidity is different in certain circumstances. Humidity is expressed in percentage of saturation.

For example: let’s say that air of 10 degrees clesius can contain a maximum of 10 grams of water vapour per cubic meter. Then 50% humidity with 10 degrees Celsius would mean that the air contains 5 grams of water vapour per cubic meter. In essence: half of what it can hold with that temperature.

Air with a temperature of 10 degrees Celsius with 50% humidity will contain a very different amount of water vapour then air with a temperature of 20 degrees and also 50% humidity. If the temperature rises, but the amount of gram water vapour per cubic meter stays the same, the relative humidity will drop. Simply said: 10 degrees Celsius with 50% humidity holds the same amount of water vapour as 20 degrees Celsius with 30% humidity.

A graph showing relative humidity
A graph showing relative humidity

Air pressure

However, pressure also plays a big role in this, which is purposely left out to make the examples easier to understand. If the pressure is raised, the relative humidity will also rise. Air under a large amount of pressure can hold very little water vapour.

Different related articles

  • How to make carpet stripes
    Carpet stripes are lines in the carpet that give the impression that some parts of the carpet ar darker/lighter then the area next to it. This can be achieved by bending the fibers one way or the other. The only purpose of this is that it can look nice to some people. Customers might be impressed and like the effect....
  • Carrand
    Carrand is a California, America based manufacturer of consumer car cleaning supplies. The company is a subsidiary of Hopkins Manufacturing from Kansas, America....
  • What is steam cleaning
    Detailing Miscellaneous
    Steam cleaning is the act of using evaporated and heated water to clean a surface. Steam has to benefit that it interacts with oils and grease without the need for an emusifier. This means it can clean dirt and grease without soap. Which leaves less residue. Steam cleaning can be used on the outside of a car as well as on the interior....
  • Carpro
    Carpro is a brand of detailing products that aims at using the latest technologies to create the best products. The brand originates from South Korea and is led by Avi. Carpro's full name is Carpro Trading Ltd....
  • A guide in detailing Steps
    There are many different steps you can take while detailing. A maintenance wash has different steps than a deep-clean wash or a 3 stage polish. In this guide I will give a very general idea on the order of those steps. More in-depth articles regarding every step will follow. This articles serves to give people a quick overview....
  • How to fabric protection
    Fabric protection is used to increase the lifespan of fabric by repelling as much dirt and stains as possible. It is commonly used on convertible roofs, seats, floormats and carpets. Fabric protection is most often done by applying a liquid....

Links to this article

There are no external links to this article. Yet.

Stay up to date with our free newsletter
Always be the first to know about new updates, articles and other informative content.
Don't miss out, opt in!
We respect your privacy. No data is used for anything other than sending the newsletter!