In severe burns, the body loses large amounts of nitrogen, in the urine and by exudation from the burned body surface.
Sometimes infection inflames the lining of a pleural cavity, causes an exudation which fills the cavity and leaves no space for the lung to expand.
After feeding on the sap of certain cultivated Oriental trees, the insects coat the tree twigs with an exudation called "lac" (from the Sanskrit word laksha, meaning 100,000 .