What is the Difference Between How Much and How Many?

The difference between "how much" and "how many" lies in the type of noun they are used with. "How much" is used with uncountable or mass nouns, while "how many" is used with countable or plural nouns.

How much: This is used to describe uncountable nouns, also known as noncount nouns, which are words that are always singular and do not have a plural form. Examples include liquids (e.g., water, milk), substances (e.g., sugar, rice), and abstract concepts (e.g., happiness, patience).
How many: This is used to describe countable nouns, which are words that have plural forms. Examples include objects (e.g., books, ideas, leaves, shoes), living beings (e.g., people, animals), and items that can be counted.

In some cases, "how many" can be used with uncountable nouns when referring to different types, kinds, or measured quantities of the noun. For example, "How many types of rice are available at the market?" In this case, the noun "rice" is an uncountable noun, but the question is asking about different types of rice, which are countable.

Here are some examples to illustrate the difference:

How much time do we have to finish the test? (Time is an uncountable noun)
How many days are there in a week? (Days are a countable noun)
How many teaspoons of sugar would you like in your coffee? (Sugar is an uncountable noun, but teaspoons are a countable noun)

Remember, if you can count the noun, use "how many" (the noun will always be plural). If you cannot count the noun, use "how much" (the noun cannot be plural).