`1.` Exposure to fire, hot liquids or metals, chemicals, electricity or the sun's ultraviolet rays. 

`-` Dẫn chứng: A burn is an injury to the skin caused by exposure to fire, hot liquids or metals, chemicals, electricity or the sun's ultraviolet rays. 

`2.` The source of the burn should be removed as soon as possible.

`-` Dẫn chứng: First aid for burns involves removing the source of the burn as soon as possible.

`3.` Because it helps ease pain and protect the burns from contaminating.

`-` Dẫn chứng: The burns should be cooled immediately with cold water. A clean, cold wet towel or dressing can be placed on less serious burns to ease pain and protect the burns from contaminating.

`4.` For at least `20` minutes.

`-` Dẫn chứng: If the burn is caused by chemicals, it should be bathed continuously with running water for at least 20 minutes to reduce the substance.

`5.` The first - aid provider should use dry, sterile dressing held in place by bandages.

 `-` Dẫn chứng: Instead, the first - aid provider should gently apply dry, sterile dressing held in place by bandages and seek immediate medical attention.

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`1` Exposure to fire , hot liquids or metals , chemicals , electricity or the sun's ultraviolet rays

`->` d/c : "A burn is an injury to the skin caused by exposure to fire, hot liquids or metals, chemicals, electricity or the sun's ultraviolet rays"

`2` As soon as possible

`->` d/c : "First aid for burns involves removing the source of the burn as soon as possible"

`3` Because it can ease pain and protect the burns from contaminating

`->` d/c : " A clean, cold wet towel or dressing can be placed on less serious burns to ease pain and protect the burns from contaminating"

`4` At least 20 minutes

`->` d/c : " If the burn is caused by chemicals, it should be bathed continuously with running water for at least 20 minutes to reduce the substance"

`5` The first-aid provider should gently apply dry, sterile dressing held in place by bandages

`->` d/c : "Instead, the first - aid provider should gently apply dry, sterile dressing held in place by bandages and seek immediate medical attention"