Chromatography and gas lamp: 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 — Oil lamp. The wick feeds oil to the flame.
4. Step 4. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
5. Step 5. Incandescent light bulb — evolved from — Gas lamp. Electricity displaced gas lighting.

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