# Energy Balance on a Closed System

In this lesson, we will incorporate the effects of mass flow across the system boundaries on the

#### energy balance equation

.
In chapter 4, we applied the

#### 1st Law

to closed systems.Change in U, EK,EP

and other forms of energy

and other forms of energy

Net energy transfer by heat and work

In chapter 4, we discussed how heat and work interactions fit into the

#### 1st Law

or#### energy balance equation

for a closed system.In this chapter, we need to discover how mass flow across the system boundary can be incorporated in the 1st Law or energy balance equation.

W

Q

Closed

System

System

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