Reference electrode and parachute: what they have in common

1. Step 1. Reference electrode — is part of — pH meter. It provides a stable reference potential.
2. Step 2. pH meter — evolved from — Litmus. A replacement for indicators.
3. Step 3. Litmus — uses — Chemical reaction. Colour from acidity.
4. Step 4. Chemical reaction — is used in — Airbag. The gas comes from an instant reaction of sodium azide.
5. Step 5. Airbag — is made of — Nylon. The airbag is nylon.
6. Step 6. Nylon — is material for — Parachute. Modern canopies are sewn from nylon.

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