Question

What is grease ? What are the conditions in which greases are used ?

Answer 1

Greases are semisolid substances consisting of an emulsion of soap with mineral/vegetable oil dispersed throughout the liquid .
Greases/Semisolid lubricants are used in the following cases:
Where oil does not remain in position because of high load ,low speed ,intermittent operations ,sudden jerks ,etc .
In bearing and gears that work at high temperatures .
In situations where dripping or spurting of oil is undesirable eg.in machines preparing paper , textiles , etc .
Where bearing needs to be sealed against entry of dust , dirt , grit or moisture .