What are the properties of a good fuel ?

Explanation

### Step-by-Step Solution:

1. **Definition of Good Fuel**: A good fuel is a substance that can release energy efficiently when burned.

2. **High Heat Release**: The first property of a good fuel is that it releases a large amount of heat per unit of mass when consumed. This means that the fuel should be capable of producing a significant amount of energy for every unit of weight.

3. **Minimal Smoke Production**: A good fuel should not produce smoke when burned. This is important because smoke can be harmful to health and the environment.

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