A hair net serves two purposes,
tied back
Laboratory flask of different types are designed to contain liquids in larger volumes.
used to magnify metals
chemestry
Laboratory and Pathology
A hair net is also known an caul. It is elasticized and is used in the laboratory as a safety device to keep hair contained.
Where a hair net I know is one of them. Also you have to wash your hands after you go to the bathroom whereever you work.
Long hair should be tied back when working in the laboratory
She dyes her hair and she uses rave and aqua net hairspray for her curls.
use for cleaning some laboratory apparatus.
a manly pony tail Apart from a hair net you could tie up your hair and use a bandanna to keep it back.
Net weaving is a permanent way of putting one's hair (a style) where a net is attach to a client's head, then attaching the hair to the net.
The way I do it is to tuck up the back of your hair to the top of your head and fold depending on the lenght of your hair. Then put the net over your hair and then move your hand and put the front of the net on the very top of your forehead.
The function of the hair net is to control loose hair so that it does not fall into and contaminate the food being prepared.
Well it depends because when I had my hair braided I never put it into a hair net but it might as well help the hair to stay nicer.
For your hair ?
Yes it is possible to use laboratory in a sentence, laboratory is a perfectly respectable English noun.