Okay.. another English lesson..
I always a little bit confuse which one is a countable noun, and which one is not.
My wife shows me a simple explanation. You can notice whether it is a countable noun or not, only by divide a “thing” into some parts.
If each part of divided thing does not represent the thing, it is countable. For example: if you devide a chair, you can not mention each part as a chair.
If each part of divided thing represents the thing, it is uncountable. For example: if you devide sugar, each part of them is always a sugar.
Hope that help..