Postage stamp paper e lead–acid battery: o que têm em comum

1. Passo 1. Postage stamp paper — faz parte de — Postage stamp. Watermarked paper.
2. Passo 2. Postage stamp — é feito de — Paper. Paper.
3. Passo 3. Paper — é material para — Hot air balloon. It was lined with paper on the inside.
4. Passo 4. Hot air balloon — utiliza — Princípio de Arquimedes. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
5. Passo 5. 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.
6. Passo 6. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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