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Open System

Quick Reference
Also Known AsOpen thermodynamic system, open boundary system

What is Open System?

An open system in thermodynamics is a system that can exchange both matter and energy with its surroundings. This is in contrast to a closed system (exchanges energy but not matter) and an isolated system (exchanges neither). Most real-world chemical and biological systems are open systems — living organisms, open reactors, and the atmosphere are all examples of open systems.

Properties & Characteristics

Exchanges both matter and energy with surroundings. Examples: open beaker of water, living cell, flowing stream, industrial reactor. Thermodynamic analysis requires accounting for mass flow. Steady-state possible (input = output). First Law for open system: ΔU = q + w + Σ(h × Δn) where h = molar enthalpy of matter transferred.

Uses & Applications

Chemical engineering process design (continuous reactors). Biological thermodynamics. Atmospheric chemistry modeling. Industrial flow processes. Heat exchangers. Environmental systems analysis.

Safety Information

Process concept — no direct safety concerns. Open systems in chemical plants may release vapors, require ventilation.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Open System
Synonyms Open thermodynamic system, open boundary system

Frequently Asked Questions

An open system in thermodynamics is a system that can exchange both matter and energy with its surroundings. This is in contrast to a closed system (exchanges energy but not matter) and an isolated system (exchanges neither). Most real-world chemical and biological systems are open systems — living organisms, open reactors, and the atmosphere are all examples of open systems.

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