The exact cause of Erdheim-Chester disease (ECD) is unknown. However, the disease is thought to represent an abnormal inflammatory process characterized by excessive proliferation and accumulation of certain cells, with associated scarring or overgrowth of fibrous connective tissue (fibrosis).
humidity (relative and absolute) The amount of water vapor in the air. Humidity is measured in two ways: (1) Absolute humidity is the percentage of water vapor actually present in the air. (2) Relative humidity is the absolute humidity divided by the amount of water that could be present in the air. Relative humidity indicates the degree of comfort or discomfort one feels from the humidity, because it indicates the amount of perspiration that can evaporate from the skin.
Humidity is REALTIVE to the temperature, hence relative humidity. You should look at the DEWPOINT, which is the way to tell how muggy the air really is. 10 degrees with 73% humidity is DRY, because the colder the temperature gets, the LESS MOISTURE that the atmosphere can hold.