Silvered glass coating and railway track: what they have in common

1. Step 1. Silvered glass coating — is part of — Dewar flask. It reflects heat radiation.
2. Step 2. Dewar flask — uses — Vacuum. A vacuum.
3. Step 3. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
4. Step 4. Newcomen engine — evolved into — Watt steam engine. Watt improved Newcomen’s engine.
5. Step 5. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.
6. Step 6. Steam locomotive — uses — Railway track. It runs on rails.

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