What is the recommended treatment if a responder's hand comes into contact with liquid oxygen?

When a responder's hand comes into contact with liquid oxygen, the recommended treatment is to cover the hand and do not allow air to come into contact. Liquid oxygen can cause serious cold burns, and immediate exposure to air can result in the formation of frostbite and further tissue damage. Therefore, isolating the affected area from air is crucial to minimize injury.

Covering the hand appropriately protects it from the elements and helps to stabilize the injury while seeking further medical help. The other options, such as immersing the hand in warm water or applying ice, could exacerbate the injury, as the sudden temperature changes can lead to more severe tissue damage. Applying first aid as with any burn doesn't take into account the specific nature of cryogenic burns caused by liquid oxygen, which requires tailored intervention.