First aid is initial assistance given to someone injured or suddenly affected by an illness until definitive medical treatment can be accessed. It involves checking an unconscious patient's airway, breathing, and circulation and placing them in the recovery position. Cardiopulmonary resuscitation (CPR) may be necessary if breathing has stopped. Burns are assessed using the "rule of nine" and treated by applying cold water and burn cream. With electric shock, bystanders should try to remove the source of electricity without direct contact and call for emergency help.