Headphone ear cushions and vacuum pump: what they have in common

1. Step 1. Headphone ear cushions — is part of — Headphones. Soft pads.
2. Step 2. Headphones — has part — Permanent magnet. A magnet moves the diaphragm.
3. Step 3. Permanent magnet — works like — Electromagnet. An electromagnet attracts iron like a permanent magnet, but only while current flows.
4. Step 4. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
5. Step 5. Mass spectrometer — has part — Vacuum pump. A vacuum system.

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