Watt steam engine e gas lamp: o que têm em comum

1. Passo 1. Watt steam engine — utiliza — Carvão mineral. Steam engines were fired with coal.
2. Passo 2. Carvão mineral — é material para — Coal gas. The gas was made by the dry distillation of coal.
3. Passo 3. Coal gas — é utilizado em — Gas lamp. Coal gas.

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