Use quantity of before singular or plural things you can measure. Use number of before plural things you can measure. There are subtle differences between amount of, quantity of and number of. The term amount of is used for things you cannot measure (See non-countable nouns).ESS AND FEWER. Amount of should be used with a singular word, and number of should be used with a plural word. Similarly, less should be used before a singular word, and fewer should be used with a plural word. See the lesson Less and fewer.
A deviated septum occurs when your nasal septum â the thin wall that separates your right and left nasal passages â is displaced to one side. A deviated septum can be caused by: A condition present at birth. In some cases, a deviated septum occurs during fetal development and is apparent at birth.
Common causes of chronic sinusitis include: 1  Nasal polyps. These tissue growths can block the nasal passages or sinuses.  Deviated nasal septum. A crooked septum â the wall between the nostrils â may restrict or block sinus passages.