Here's why:

* Room temperature is typically considered to be around 20-25 degrees Celsius (68-77 degrees Fahrenheit).

* Cyclopentane's boiling point is 49.3 degrees Celsius (120.7 degrees Fahrenheit).

* Substances exist as liquids below their boiling point.

Since room temperature is below cyclopentane's boiling point, it will be in its liquid state.