What is the purpose of smelling salt in first aid box?

Smelling salts are a traditional first aid item used to revive people who have fainted or are feeling lightheaded. They work by stimulating the trigeminal nerve, which is responsible for sending signals from the nose to the brain. This can help to increase alertness and reduce the feeling of faintness.

Smelling salts are typically made from ammonium carbonate, which is a strong alkaline substance. When it comes into contact with water, it releases ammonia gas, which is what causes the pungent odor. This odor is what stimulates the trigeminal nerve and helps to revive someone who has fainted.

Smelling salts should be used with caution, as they can be irritating to the eyes, nose, and throat. They should also not be used on people who have heart problems, asthma, or other respiratory problems.

To use smelling salts, simply hold the container near the person's nose for a few seconds. If they do not revive within a few minutes, seek medical attention.