Gelatin capsule shell and car: what they have in common

1. Step 1. Gelatin capsule shell — is part of — Capsule. It dissolves in the stomach.
2. Step 2. Capsule — uses — Chemical reaction. The shell dissolves in the stomach.
3. Step 3. Chemical reaction — is used in — Airbag. The gas comes from an instant reaction of sodium azide.
4. Step 4. Airbag — is part of — Car. Airbags.

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