Essential Chemistry for IGCSE - Organic Chemistry And Petrochemicals (Section 2 - No. 21)
Which of the following is the main difference between a fuel and a lubricant?
Fuel is a liquid; a lubricant is a solid.
A fuel is burned; a lubricant reduces friction.
A fuel contains carbon; a lubricant does not.
A fuel is used for power; a lubricant is used for heat.
Explanation
Fuels are burned to provide energy, while lubricants reduce friction between moving parts.
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