LMendoza 2I
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Joined: Sat Jul 22, 2017 3:00 am

What are the main differences between an isolated and adiabatic system?

Rachel Formaker 1E
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### Re: Isolated vs. Adiabatic system

The internal energy of an isolated system will not change over time.

In an adiabatic system, energy is not transferred as heat, but the internal energy can still change if energy is transferred to or from the system as work.
For adiabatic systems, ΔU=w because q=0.

April P 1C
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Joined: Thu Jan 12, 2017 3:01 am

### Re: Isolated vs. Adiabatic system

Isolated systems have no contact with its surroundings. This means they cannot exchange matter or energy with the surroundings.

From the textbook, "A system with adiabatic walls is not necessarily an isolated system: energy may be transferred to or from a system in an adiabatic container as work. In a closed adiabatic system, deltaU=w "

Diane Bui 2J
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### Re: Isolated vs. Adiabatic system

Katherine Jordak 1H
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Joined: Fri Sep 29, 2017 7:05 am

### Re: Isolated vs. Adiabatic system

There are different types of calorimeters. I know a bomb calorimeter is a closed system.

Erik Khong 2E
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Joined: Fri Sep 29, 2017 7:07 am

### Re: Isolated vs. Adiabatic system

In an adiabatic process, energy is transferred to its surroundings only as work while an isolated system cannot transfer energy at all.

William Xu Dis 1D
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Joined: Fri Sep 29, 2017 7:05 am

### Re: Isolated vs. Adiabatic system

To answer Diane's question, a normal (coffee cup calorimeter) is a closed system, while a bomb calorimeter is an isolated system. Unless if there is a heat source in the calorimeter (not including the reaction) the calorimeter is adiabatic so any heat generated will be from the material sample placed in the calorimeter.

Abby Ellstrom 1I
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Joined: Fri Sep 29, 2017 7:04 am

### Re: Isolated vs. Adiabatic system

In isolated systems, no energy is transferred to the surroundings. In an adiabatic system energy is not transferred as heat to surroundings but as work.

Paula Dowdell 1F
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Joined: Tue Nov 15, 2016 3:00 am

### Re: Isolated vs. Adiabatic system

Another way of thinking about it is that an adiabatic process is a process where the net heat transfer to the working gas is zero vs an isolated system, which is a system that is completely shut off from the surroundings.