Steel edges e voltaic pile: o que têm em comum

1. Passo 1. Steel edges — faz parte de — Snowboard. They cut the snow in a turn.
2. Passo 2. Snowboard — evoluiu de — Surfboard. Surfing on snow.
3. Passo 3. Surfboard — utiliza — Princípio de Arquimedes. Buoyancy.
4. Passo 4. Princípio de Arquimedes — é utilizado em — Hydrometer. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
5. Passo 5. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
6. Passo 6. Lead–acid battery — evoluiu de — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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