What does an airbag, used for the safety of a car driver, contain?

What does an airbag, used for the safety of a car driver, contain?

کار ڈرائیور کی حفاظت کے لیے استعمال ہونے والے ایئر بیگ میں کیا ہوتا ہے؟
Explanation

The driver-side airbag is a container containing about 50 grams of sodium azide.

 The passenger side container holds about 200 grams of sodium azide.