Spirit level bubble vial and voltaic pile: what they have in common

1. Step 1. Spirit level bubble vial — is part of — Spirit level. A vial with liquid and a bubble.
2. Step 2. Spirit level — uses — Universal gravitation. The bubble rises to the highest point.
3. Step 3. Universal gravitation — is used in — Gravity flow. It flows downhill under gravity.
4. Step 4. Gravity flow — is used in — Gutter. Drainage.
5. Step 5. Gutter — is made of — Zinc. Galvanized steel.
6. Step 6. Zinc — is material for — Voltaic pile. The pile is discs of zinc.

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