Glass test tube e submarine: o que têm em comum

1. Passo 1. Glass test tube — faz parte de — Test tube. A glass tube with a rounded bottom.
2. Passo 2. Test tube — é feito de — Glass. Glass.
3. Passo 3. Glass — é material para — Hydrometer. A glass tube with a weight at the bottom and a scale at the top.
4. Passo 4. Hydrometer — é utilizado em — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
5. Passo 5. Lead–acid battery — faz parte de — Submarine. Underwater, electric motors run on batteries.

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