Is it possible to stop an airbag with your arm?

No, it is not possible to stop an airbag with your arm. Airbags deploy at extremely high speeds—typically around 200 mph—making it impossible for a person to react quickly enough to block or stop one with their arm. Attempting to do so could result in serious injury, as airbags are designed to protect occupants during a collision, not to be physically interacted with. It's always best to follow safety guidelines and keep your arms and hands away from the airbag deployment area.