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The imagined wall separating a system from its surroundings, across which heat and work pass, is the:
ABulkhead
BBoundary
CBarrier film
DBaseline
Answer & Solution
Correct answer: B. Boundary
1. The system has to end somewhere for bookkeeping.
2. Energy exchanges are counted as they cross that line.
3. That line is the boundary.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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