Biofuel and boyle’s air pump: what they have in common

1. Step 1. Biofuel — is used in — Diesel engine. A diesel also runs on vegetable oil.
2. Step 2. Diesel engine — has part — Piston. Pistons move in the cylinders.
3. Step 3. Piston — is part of — Boyle’s air pump. A plunger.

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