Discussion
Study the following table :
| Fuel | Calorific value | State | Ignition temp. |
|---|---|---|---|
| A | High | solid | high |
| B | Moderate | gas | high |
| C | Moderate | gas | moderate |
| D | Low | liquid | low |
Which is best suited as domestic fuel ?
Answer: C
The fuel best suited for domestic use is C.
A good domestic fuel should be easy to handle and burn cleanly, so a gas is preferred to a solid or liquid. Its ignition temperature should be moderate: low enough to light easily, but not so low that it catches fire accidentally. And it should give reasonable heat.
Fuel C is a gas with moderate calorific value and moderate ignition temperature, so it meets all three. Fuel A is a solid with a high ignition temperature, hard to light. Fuel B is a gas but also hard to ignite. Fuel D has a low calorific value and a low ignition temperature, which makes it both weak and dangerous to store.
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