Biplane and heat pump: what they have in common

1. Step 1. Biplane — has part — Wing. Two tiers of wings.
2. Step 2. Wing — is part of — Jet airliner. A swept wing.
3. Step 3. Jet airliner — has part — Pressurized cabin. A pressurized cabin.
4. Step 4. Pressurized cabin — has part — Compressor. Air is bled from the engine compressors.
5. Step 5. Compressor — is part of — Heat pump. A compressor.

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