Relative humidity is the percentage or ratio of the amount of water vapor in a volume of air at a given temperature and the amount that it can hold at that given temperature. An amount of water vapor in warm air will result to a lower relative humidity than in cool air.ummary: 1.Humidity is the amount of water vapor in the atmosphere while relative humidity is one type of humidity. 2.Humidity is the water content of the mixture of water vapor and other elements found in the air while relative humidity is the percentage of water vapor in the air at a given temperature.
Actinic keratosis (AK) is a UV lightâinduced lesion of the skin that may progress to invasive squamous cell carcinoma. It is by far the most common lesion with malignant potential to arise on the skin. See the image below.
Actinic keratosis. Overview. Actinic keratosis Actinic keratoses are scaly spots or patches on the top layer of skin. With time the spots or patches may become hard with a wart-like surface. An actinic keratosis (ak-TIN-ik ker-uh-TOE-sis) is a rough, scaly patch on your skin that develops from years of exposure to the sun. It's most commonly found on your face, lips, ears, back of your hands, forearms, scalp or neck.