Wick and pneumatic tube: what they have in common

1. Step 1. Wick — is part of — Kerosene lamp. A wick.
2. Step 2. Kerosene lamp — uses — Kerosene. The fuel.
3. Step 3. Kerosene — is used in — Ramjet. The fuel is kerosene.
4. Step 4. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
5. Step 5. Compressed air — is used in — Pneumatic tube. Air pressure.

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