Question

Which among the following is best lubricant?

• A. Solids
• B. Liquids
• C. Gases
• D. Both B and C

Answer 1

Answer: (B)

Liquids

A good lubricant generally possesses the following characteristics:

1) High boiling point and low freezing point (in order to stay liquid within a wide range of temperature)

2) High viscosity index

3) Thermal stability

4) Hydraulic stability

5) Corrosion prevention

6) High resistance to oxidation.

Now, only liquids can have all the above properties.