Dental adhesive bonding agent and sonar: what they have in common

1. Step 1. Dental adhesive bonding agent — is part of — Dental filling. It bonds the filling to the tooth.
2. Step 2. Dental filling — is made of — Mercury. Amalgam is a mercury alloy.
3. Step 3. Mercury — is part of — Hydrometer. Old hydrometers used mercury or lead shot as the weight to keep them upright.
4. Step 4. Hydrometer — is used in — Lead–acid battery. A car battery's charge is checked with a hydrometer by the density of its acid.
5. Step 5. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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