Kettle spout e Bomba de ar de Boyle: o que têm em comum

1. Passo 1. Kettle spout — faz parte de — Kettle. A drain.
2. Passo 2. Kettle — evoluiu para — Chaleira elétrica. A kettle with a heater.
3. Passo 3. Chaleira elétrica — tem como parte — Heating element. A heating element in the base heats the water.
4. Passo 4. Heating element — funciona como — Incandescent light bulb. A lamp and a heater use the same effect — a conductor heated by current; they differ in purpose, light or heat.
5. Passo 5. Incandescent light bulb — utiliza — Vacuum. The bulb was evacuated so the filament would not burn out.
6. Passo 6. Vacuum — é utilizado em — Bomba de ar de Boyle. The pump draws out the air.

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