Helium and electric generator: what they have in common

1. Step 1. Helium — uses — Spectroscope. Helium was discovered by spectroscopy in the solar spectrum.
2. Step 2. Spectroscope — uses — Bunsen burner. The burner’s colourless flame made it possible to study the spectra of elements.
3. Step 3. Bunsen burner — uses — Natural gas. Gas.
4. Step 4. Natural gas — is used in — Thermal power station. Gas.
5. Step 5. Thermal power station — has part — Electric generator. Generators.

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