There are essentially two types of condensation. Ship sweat is caused largely by parts of cargo getting heated and giving off vapor which condenses on ship’s structure. Cargo sweat is caused by condensation on cold cargo, of moisture carried by air in ship’s hold. Sweat damage can ruin many types of cargo. Textile goods may be discolored, metal and machinery parts may be rested, food products may lose their taste, fibers and wooden material may be stained and chemical substance may change their composition and properties.