Universe is an example of

Options

A. Open system
B. Close system
C. Isolated system
D. Closed isothermal system

Answer

**Step-by-Step Solution:**

1. **Understanding the Concept of a System**: In thermodynamics, a system is defined as a specific portion of matter in a given region of space that is being studied. Systems can be classified into three types: open, closed, and isolated systems.

2. **Defining Open, Closed, and Isolated Systems**:
- **Open System**: Can exchange both matter and energy with its surroundings.
- **Closed System**: Can exchange energy but not matter with its surroundings.
- **Isolated System**: Cannot exchange either matter or energy with its surroundings.

3. **Analyzing the Universe**: The universe encompasses all of space, time, matter, and energy. It is not bounded by any external environment and contains everything that exists.

4. **Mass Exchange**: The universe does not allow for the transfer of mass to or from any external system. No matter how much mass exists, it cannot be added to or removed from the universe.

5. **Energy Exchange**: Similarly, there is no external source from which the universe can gain energy, nor can it lose energy to an external environment.

6. **Conclusion**: Since the universe does not exchange mass or energy with anything outside of itself, it is classified as an **isolated system**.

**Final Answer**: The universe is an example of an **isolated system**.

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