Salting and heron’s aeolipile: what they have in common

1. Step 1. Salting — uses — Chemical reaction. Salt draws out water, suppressing microbes.
2. Step 2. Chemical reaction — is used in — Percussion cap. Mercury fulminate explodes when struck.
3. Step 3. Percussion cap — is part of — Cartridge. A primer in the case.
4. Step 4. Cartridge — is part of — Machine gun. Cartridges in a belt.
5. Step 5. Machine gun — uses — Reaction force. Recoil energy reloads the weapon.
6. Step 6. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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