## System Types

Cyianna 2F
Posts: 34
Joined: Wed Nov 16, 2016 3:04 am

### System Types

Can someone please give me specific examples of each type of system(open, closed, isolated) and why they're that way? It's difficult to grasp the difference between them.

Andrea Grigsby 1I
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

### Re: System Types

the example Dr lavelle gave in class was just to think of 3 test tubes
- Open system: both matter and energy can travel out, which would be an open test tube with no insulation
- Closed system: only energy can travel out, not matter, which would be a closed test tube
- Isolated system: neither matter nor energy can travel out, which is like an insulated closed test tube (as no energy can be transferred to the surroundings and no matter can travel out of the opening of the test tube

ZoeHahn1J
Posts: 63
Joined: Sat Jul 22, 2017 3:01 am
Been upvoted: 1 time

### Re: System Types

An open system is unique in that matter and energy (heat, work) can be transferred in/out of it (like a person, or a houseplant). Closed systems cannot exchange matter w/ surroundings, only energy (like an uninsulated tupperware - food won't get out, but the heat from the food will). Isolated systems don't exchange anything w/ their surroundings, so delta U off isolated systems is always 0.

Nate O 2L
Posts: 15
Joined: Fri Sep 29, 2017 7:06 am

### Re: System Types

Okay I see this but how will this affect the different types of formulas we are going to have to use?

Kailey Brodeur 1J
Posts: 34
Joined: Thu Jul 27, 2017 3:00 am

### Re: System Types

If the system is isolated, no energy or mass can be transferred between the system and surroundings. This means that the internal energy of an isolated system cannot change (the first law of thermodynamics) delta U = q + w = 0. In a closed system, mass cannot be transferred, but energy can be. In an open system, both energy and matter can be transferred. However, I don't think we can specifically relate equations to system because we have to be aware of other factors, such as if the pressure or volume is constant or if we are dealing with ideal gases.

Leanne Wong 1H
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am
Been upvoted: 1 time

### Re: System Types

open system = matter and energy exchanged with the surrounding
closed system = only energy exchanged with the surrounding
isolated system = no matter or energy is exchanged with the surrounding

Amelia Georgius 1K
Posts: 25
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 1 time

### Re: System Types

In an open system, both energy and matter can be exchanged between the system and the surroundings. In a closed system, only energy can be exchanged between the system and the surroundings, and in an isolated system neither energy or matter can be exchanged between the system and the surroundings.

Erik Khong 2E
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: System Types

If you want specific examples, there are some in the textbook:

Open: an open flash
Closed: a flask with a cork
Isolated: a plugged flask in a thermally-insulated material