In science and engineering, a system is the part of the universe that is being studied, while the environment is the remainder of the universe that lies outside the boundaries of the system. It is also known as the surroundings or neighborhood, and in thermodynamics, as the reservoir. Depending on the type of system, it may interact with the environment by exchanging mass, energy (including heat and work), linear momentum, angular momentum, electric charge, or other conserved properties. In some disciplines, such as information theory, information may also be exchanged. The environment is ignored in analysis of the system, except in regard to these interactions.

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article may be confusing or unclear to readers. (March 2016) This article does not cite any sources. (March 2015)

• Bioenergetic systems – energy system
• Earth system science
• Environment (biophysical)
• Environmental Management System
• Thermodynamic system

• Geography of transport systems Archived 2017-03-12 at the Wayback Machine people.hofstra.edu
• Environmental Management Systems epa.gov
• Earth's Environmental Systems Archived 2018-05-31 at the Wayback Machine eesc.Columbia.edu
• Environmental Education Archived 2022-12-11 at the Wayback Machine

This physics-related article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e

This systems-related article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e