Black absorber plate and railway track: what they have in common

1. Step 1. Black absorber plate — is part of — Solar water heater. A black plate that absorbs light.
2. Step 2. Solar water heater — has part — Window glass. The glass on top creates a greenhouse effect.
3. Step 3. Window glass — is made of — Float glass. Float glass.
4. Step 4. Float glass — uses — Tin. Glass spreads out over molten tin.
5. Step 5. Tin — is material for — Model railway. The first models were tinplate.
6. Step 6. Model railway — uses — Railway track. It runs on rails.

Open Evothings