Index card und lead–acid battery: was sie gemeinsam haben

1. Schritt 1. Index card — ist Teil von — Index card. A stiff card of standard size.
2. Schritt 2. Index card — ist hergestellt aus — Paper. Paper.
3. Schritt 3. Paper — ist Material für — Hot air balloon. It was lined with paper on the inside.
4. Schritt 4. Hot air balloon — nutzt — Archimedisches Prinzip. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
5. Schritt 5. Archimedisches Prinzip — wird verwendet in — Hydrometer. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
6. Schritt 6. Hydrometer — wird verwendet in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.

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