What are the functions of a lubricant?

The factions of lubricants are as follows-

• It reduces frictional; resistance between metallic surfaces.
• It reduces maintenance and running cost of machines.
• It reduces local heating of sliding metal shut down conditions by avoiding direct contact with atmospheric gases with the machine parts.
• It acts as a seal preventing entry of dirt, dust and moisture.
• It acts as a coolant in transformers, drilling and cutting of metals by tools.
• It acts as a cleaning agent to wash off solid particles produced combustion.
• It acts as a hydraulic fluid in aircraft.