Absolute zero and submarine: what they have in common

1. Step 1. Absolute zero — uses — Thermodynamics. The thermodynamic scale.
2. Step 2. Thermodynamics — was inspired by — Watt steam engine. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
3. Step 3. Watt steam engine — evolved into — Steam turbine. The turbine replaced piston engines in large installations.
4. Step 4. Steam turbine — is part of — Nuclear submarine. A turbine turns the propeller.
5. Step 5. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.

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