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.
What is WEATHER? Weather is the air temperature, cloud cover, precipitation, and wind at any particular time in any particular place. Weather reflects the prevailing conditions of the air masses overlying the land and seas over the entire globe. Weather patterns over a period of time present a picture of climate.