Definition:1 ) Oil mist is the aerosol defined as droplet particles mainly above 1 micrometer in size, which is often formed when oil emulsions is used as a coolant/lubricant during the machining of metal and ceramic materials.
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2 ) Oil mist refers to oil droplets suspended in the air in the size range 1~10 μm.
Oil mist may form when high pressure fuel oil, lubricating oil, hydraulic oil, or other oil is sprayed through a narrow crack, or when leaked oil connects with a high temperature surface, vaporizes, and comes in contact with low air temperature.
This happens while the fluids interact with the moving parts during machining.
Oil mist inside the crankcase can cause a bigger problem.