Chromium and rocket: what they have in common

1. Step 1. Chromium — is material for — Stainless steel. At least 10.5% chromium.
2. Step 2. Stainless steel — is material for — Water-jet propulsion. The impeller is stainless steel.
3. Step 3. Water-jet propulsion — uses — Reaction force. A jet of water.
4. Step 4. Reaction force — is used in — Rocket. A rocket moves by reaction force.

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