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Yes^, I believe so because the surroundings in an open beaker are so large that the pressure is constant /unchanging. I might be wrong, but I think this is when Dr.Lavelle used the examples about whether the temperature of the surroundings would be affected by an individual lighting a match. The pressure of an open system would not change either.
All of the above are correct-- one more example I found helpful with regard to the difference between system and surroundings was the ocean analogy. If you add a bucketful of water to the ocean, it doesn't really change the volume or pressure.
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