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  Dew Point advert image shown if present

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A measure of the amount of moisture within the air. It is the temperature of the air to what it has to be cooled to when it is saturated with water vapour. If air is in contact with a surface which is cooler than the air temperature, then water vapour will condense on that surface to form dew. A high dew point indicates that there is a high amount of moisture present.