Telephone and heat pump: what they have in common

1. Step 1. Telephone — evolved into — Mobile phone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.
2. Step 2. Mobile phone — has part — Integrated circuit. Inside a phone are microchips: processor, memory, radio.
3. Step 3. Integrated circuit — uses — Cleanroom. Production in cleanrooms.
4. Step 4. Cleanroom — uses — Air conditioner. Air filtration.
5. Step 5. Air conditioner — uses — Heat pump. An air conditioner is a heat pump that carries heat out of the room.

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