Spectroscope and centrifugal pump: what they have in common

1. Step 1. Spectroscope — uses — Bunsen burner. The burner’s colourless flame made it possible to study the spectra of elements.
2. Step 2. Bunsen burner — uses — Natural gas. Gas.
3. Step 3. Natural gas — uses — Pipeline. Gas is transported through pipes.
4. Step 4. Pipeline — has part — Centrifugal pump. Pumping stations.

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