Paperboard layer and heat pump: what they have in common

1. Step 1. Paperboard layer — is part of — Tetra Pak. Stiffness.
2. Step 2. Tetra Pak — is made of — Paper. Cardboard.
3. Step 3. Paper — is used in — Rotary printing press. It prints on a paper web.
4. Step 4. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
5. Step 5. Watt steam engine — inspired — Thermodynamics. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
6. Step 6. Thermodynamics — is used in — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.

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