Question

how does liquid nitrogen help us

Answer 1

It is used for a variety of things, such as a coolant for computers
in medicine to remove unwanted skin
warts and pre-cancerous cell
in cryogenics

Answer 2

It has various application in lots of fields. Some of the gamous applications are-
1. In medicine'
a) cryotherapy to remove warts.
b) cryopreservation of sperms and eggs.
2.In culinary for ice creams and cocktails too.
3.In vaccum pumps etc.

More application are in Hollywood.
a) To kill Terminations from the future .
b) To cryo imprison fugitives and crops.