The front passenger side airbag is housed in the dashboard. When a collision occurs, the airbag breaks through the tear-seam (an indented line partition) of the dashboard as it inflates to protect the passenger. Since the space between the front passenger seat and the dashboard is larger than the space between the driver and the steering wheel, the passenger seat airbag is about twice the size of the driver side airbag.
Passenger Airbags Deployment Videos
Slow Motion Deployment of Actual Airbag
Slow Motion in-car Simulation