Strap-on rocket boosters and aerosol can: what they have in common

1. Step 1. Strap-on rocket boosters — is part of — R-7 rocket. Four first-stage boosters — the “cluster layout”.
2. Step 2. R-7 rocket — is made of — Oxygen. The oxidizer is liquid oxygen.
3. Step 3. Oxygen — is used in — Oxygen concentrator. Oxygen.
4. Step 4. Oxygen concentrator — has part — Valve. They switch the columns.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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