Dielectric heating and gas lamp: what they have in common

1. Step 1. Dielectric heating — is used in — Microwave oven. The field heats the water in the food.
2. Step 2. Microwave oven — has part — Magnetron. The magnetron generates the microwaves.
3. Step 3. Magnetron — uses — Vacuum. It works in a vacuum.
4. Step 4. Vacuum — is used in — Incandescent light bulb. The bulb was evacuated so the filament would not burn out.
5. Step 5. Incandescent light bulb — evolved from — Gas lamp. Electricity displaced gas lighting.

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