Carbide lamp and smartphone: what they have in common

1. Step 1. Carbide lamp — uses — Acetylene. Burning acetylene.
2. Step 2. Acetylene — uses — Chemical reaction. Calcium carbide + water.
3. Step 3. Chemical reaction — is used in — Airbag. The gas comes from an instant reaction of sodium azide.
4. Step 4. Airbag — has part — Accelerometer. The crash sensor is an accelerometer.
5. Step 5. Accelerometer — is part of — Smartphone. The accelerometer rotates the screen.

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