what is a burn
A burn is a type of injury to flesh or skin caused by heat, electricity, chemicals, friction, or radiation. Burns that affect only the superficial skin are known as superficial or first-degree burns. When damage penetrates into some of the underlying layers, it is a partial-thickness or second-degree burn.In a full-thickness or third-degree burn, the injury extends to all layers of the skin.hemicals cause from 2 to 11% of all burns and contribute to as many as 30% of burn-related deaths. Chemical burns can be caused by over 25,000 substances, most of which are either a strong base (55%) or a strong acid (26%). Most chemical burn deaths are secondary to ingestion.