Chromatography and newcomen engine: what they have in common

1. Step 1. Chromatography — uses — Capillary action. Paper chromatography.
2. Step 2. Capillary action — is used in — Wick. Fuel rises up the wick by capillary forces.
3. Step 3. Wick — is part of — Davy lamp. A wick.
4. Step 4. Davy lamp — is used in — Coal mine. Protection against methane explosions.
5. Step 5. Coal mine — is used in — Newcomen engine. Pumping water out of mines.

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