This is the 1760th most frequent Russian word.
жидкость
The Russian word "жидкость" means "liquid" in English.
In this sentence, "жидкостью" is used in instrumental case to describe the contents of the bottle
Эта бутылка заполнена прозрачной жидкостью.
This bottle is filled with transparent liquid.
Here, "жидкости" is in the genitive case, indicating liquid as a measurable quantity within the engine compartment.
Нужно проверить уровень жидкости в двигателе.
We need to check the fluid level in the engine.
In this usage, "жидкость" is used in accusative case, referring to liquid as an object affected by the action of spilling.