Barômetro e voltaic pile: o que têm em comum

1. Passo 1. Barômetro — é feito de — Mercury. A column of mercury.
2. Passo 2. Mercury — faz parte de — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
3. Passo 3. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
4. Passo 4. 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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