Spirit level bubble vial and transformer: 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 — Hydroelectric power station. The energy of falling water.
4. Step 4. Hydroelectric power station — is a kind of — Power station. A kind of power station.
5. Step 5. Power station — is part of — Electrical grid. Power stations feed the grid.
6. Step 6. Electrical grid — has part — Transformer. Transformer substations.

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