Consider a bathtub filled with water, with a plug in the drain. How long would this be considered a closed system?  A. a few seconds   B. 2 hours   C. 10 hours   D. 1–2 days

Is this a trick question? . . a closed system doesn't exchange any matter with its surroundings and isn't subject to any external force, it is essentially an isolated system.In the case of a bathtub, it is open immediately to evaporation, so the truth is this system is never closedthe correct answer is E.) none of the above

Answer:The answer is a few seconds since it is closed but the water drains after 3-5 seconds. Explanation:I took the test. BAM!