Beeswax and dewar flask: what they have in common

1. Step 1. Beeswax — is material for — Candle. Expensive candles were made of beeswax.
2. Step 2. Candle — has part — Wick. A candle’s wick.
3. Step 3. Wick — is part of — Oil lamp. The wick feeds oil to the flame.
4. Step 4. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
5. Step 5. Incandescent light bulb — uses — Vacuum. The bulb was evacuated so the filament would not burn out.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

Open Evothings