What technique is used for rescue breathing on an adult?

The technique involving using a mask and providing continuous air is considered the most effective method for rescue breathing on an adult. When utilizing a mask, it allows for a better seal on the face, minimizing the risk of air leaks, and ensures that the breaths delivered are more effectively introduced into the lungs. This method can be particularly beneficial in maintaining proper ventilation, especially in emergency situations.

Additionally, using a mask can help protect the responder from potential exposure to pathogens, making the rescue process safer for both the victim and the rescuer. This approach forms part of the comprehensive method of providing care during a respiratory emergency, as maintaining adequate oxygenation is crucial for the victim's survival.

In contrast, other techniques may not ensure effective ventilation or could introduce risks, which makes the use of a mask a preferred choice in professional and layperson rescues alike.