# Entropy Change for an Isolated System

This is called the

#### Principle of Increasing Entropy

.
Consider the

#### isolated system

, shown here.Recall from Chapter 1 that no mass or energy crosses the boundary of an isolated system.

Therefore, an

#### isolated system

is a closed, adiabatic system.0

because:

**Isolated closed system**

The universe is an isolated system.

Therefore, we can conclude that:

Therefore, we can conclude that:

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