The calorific value and ignition temperature of fuel A are $55 kJ / g$ and $80^{\circ} C$, respectively. These values for fuel B are $80 kJ / g$ and $10^{\circ} C$, respectively. On burning, the fuel A produces $CO _2$ and $H _2 O$ while the fuel B produces $CO _2, CO$ and $SO _2$. Give three points of relative and disadvantages of these two fuels.
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Fuel A:
- Lower calorific value of $55 kJ / g$ (Disadvantage)
- Moderate ignition temperature ofa $80^{\circ} C$ (Advantage)
- No harmful gases produced (Advantage)

Fuel B:
- High calorific value of $80 kJ / g$ (Advantage)
- Very low ignition temperature of $10^{\circ} C$ (Disadvantage)
- Harmgul gases like CO and SO2 produced (Disadvantage)
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