The exchange of energy but not mass is what type of system? Open Isolated Closed

## Step 1<br />The problem is asking us to identify the type of system where energy can be exchanged, but mass cannot. This is a fundamental concept in thermodynamics, which is the study of heat and temperature and their relation to energy and work.<br /><br />## Step 2<br />There are three types of systems in thermodynamics: open, closed, and isolated. <br /><br />### **Open System**: <br />In an open system, both energy and mass can be exchanged with the surroundings. <br /><br />### **Closed System**: <br />In a closed system, energy can be exchanged with the surroundings, but mass cannot. <br /><br />### **Isolated System**: <br />In an isolated system, neither energy nor mass can be exchanged with the surroundings. <br /><br />## Step 3<br />Given the conditions in the problem, the system where energy can be exchanged, but mass cannot, is a closed system.