What do we call the part of the universe that is not part of the system
surrounding, surroundings
First two paragraphs.
http://en.wikipedia.org/wiki/Thermodynamic_system
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The part of the universe that is not part of the system is typically referred to as the surroundings. In the context of thermodynamics, a system is defined as a specific portion of space that is under observation or study. The surroundings, on the other hand, include everything outside of the system that can interact with it.
To determine what is considered the surroundings, you need to define the boundaries of the system. This can be done by identifying the region or objects of interest and isolating them for analysis. Anything beyond those defined boundaries is considered part of the surroundings.
The concept of system and surroundings is crucial in thermodynamics, where energy and matter can flow between the system and the surroundings. By understanding the system and its interactions with the surroundings, scientists can study the behavior and changes occurring within a specific part of the universe.