Fischer-Tropsch process.

Explanation

### Step-by-Step Solution for Fischer-Tropsch Process

1. **Definition**: The Fischer-Tropsch process is a chemical reaction that converts carbon monoxide (CO) and hydrogen (H2) into liquid hydrocarbons (synthetic petroleum) through a series of reactions.

**Hint**: Remember that this process is primarily about converting gas into liquid fuel.

2. **Starting Material**: The process begins with coal, which is first converted into coal gas, also known as synthesis gas (syngas). Syngas is a mixture of carbon monoxide and hydrogen.

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