That’s why a house with little or no insulation will be more prone to condensation than a well insulated one. Assuming of course the source of the water vapour (the shower) is now turned off and not adding to the level of water vapour in the air. Once the air’s saturated, condensation will form on any surface that is at the same temperature or lower than the air temperature.īut if your were to warm the air in the room up further (assuming air pressure remains constant) the air would then be capable of holding more moisture. However in your bathroom, when the shower’s in use, there’s so much steam that the air will get saturated (100% relative humidity) very quickly. So if your home is nice and warm the air in it will be able to hold more moisture before it starts to condense. Temperature is the second element to affect our dew point definition and has just as much effect on dew point as humidity does.Īt higher temperatures the air can hold more moisture. So when the humidity level gets to 100% it doesn’t matter what the air temperature is, as condensation will occur at any temperature once humidity levels reach 100% as the air can’t physically hold any more moisture. At which point it condenses and forms dew. So as the temperature drops (assuming the air pressure remains constant) the relative humidity increases until it gets to 100%. The lower the temperature, the higher the level of humidity. Affect of Humidity of Dew Point:Īs you’ll no doubt be aware the humidity level in the air is referred to as a percentage level e.g. So if that air came into contact with a surface that was cooler than the air temperature, dew would start to form on that surface. So if someone was to say to you that the relative humidity was 100%, what they’re actually saying is, at the current air temperature and air pressure the air is completely saturated with water.
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