Oil lamp e vacuum pump: o que têm em comum

1. Passo 1. Oil lamp — evoluiu para — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
2. Passo 2. Incandescent light bulb — utiliza — Vacuum. The bulb was evacuated so the filament would not burn out.
3. Passo 3. Vacuum — é utilizado em — Vacuum pump. The pump creates a vacuum.

Abrir Evothings