Ruler body and freezer: what they have in common

1. Step 1. Ruler body — is part of — Ruler. Wood, metal or plastic.
2. Step 2. Ruler — has part — Measurement scale. Marked graduations.
3. Step 3. Measurement scale — is part of — Barometer. Millimetres of mercury.
4. Step 4. Barometer — uses — Pressure. It measures pressure.
5. Step 5. Pressure — is used in — Compressor. It compresses air.
6. Step 6. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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