Is study a countable or uncountable noun?

"Study" can be both a countable and an uncountable noun, depending on the context:

Countable:

* When referring to a specific period of focused learning: "I'm doing a study on the effects of caffeine."

* When referring to a particular academic work: "She wrote a study on the history of the city."

* When referring to a room or space designated for learning: "The library has a quiet study room for students."

Uncountable:

* When referring to the general act of learning: "He devoted himself to study."

* When referring to a body of knowledge: "The study of history is fascinating."

Example:

* Countable: "I did three studies for my biology class."

* Uncountable: "I enjoy the study of literature."

To determine whether "study" is countable or uncountable in a given sentence, consider the context and whether it refers to a specific instance of learning or the general concept of learning.