Amount of – is for uncountable nouns (liquids – water, tea, gases – air, oxygen, thoughts – happiness, anxiety, abstract ideas – knowledge, information, democracy, etc.)
Number of – is for countable nouns (women, men, cats, dogs, glasses, books, computers, trees etc.)
Any amount of information will do.
Agriculture consumes a great amount of water.
I think she has a fair amount of sense. (fair – in this context fair means good, it has an understated feeling)
*A number of cars are parked in front of my house.
**The number of guests is 20.
A great number of students battled for freedom of speech.
- *For phrases which start with ‘a number of’ a plural verb must follow. So for the verb ‘be’ use ‘are’ instead of ‘is’.
- **For phrases which start with ‘the number of’ use a singular verb. So ‘is’ instead of ‘are’.