The noun 'Styrofoam' is an uncountable noun as a word for a substance.
Some uncountable nouns for substances use a plural form exclusively for 'types of' or 'kinds of''. However, I don't know if there is more than one kind of Styrofoam.
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Styrofoam is a countable noun. It refers to a specific material made from polystyrene foam.
"Lamps" is a countable noun because you can easily quantify and count the number of individual lamps.
"Clothes" is a plural noun and is considered countable. It refers to individual items such as shirts, pants, dresses, etc.
Weather is typically treated as an uncountable noun in English. It is considered a collective concept that cannot be easily quantified into individual units.
Petrol is typically treated as uncountable in British English, while in American English, it can be countable when referring to specific quantities.
Yes, "jar" is considered a countable noun, but it can be used as a mass noun in certain contexts like "a jar of honey" where the jar is being referenced more for the contents it holds rather than the physical container itself.