## Systems

Hannah Pham 1D
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

### Systems

What's a quick way to know if something is open, closed, or isolated? It gets confusing.

Elisa Bass 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Re: Systems

Open systems can exchange both matter and energy with the surroudings. I think of it like an open, uninsulated container. Closed systems can exchange just energy. So no matter can be added to change the system, but energy can be exchanged with the surroundings, so basically any closed container. Isolated systems do not interact with the surroundings, so neither heat nor matter can be exchanged. I think of it like a closed thermos.

Ryan Troutman 4L
Posts: 68
Joined: Fri Sep 28, 2018 12:22 am

### Re: Systems

Usually the problem will say "In a closed system" or "In an open system..., however if you're trying to find exactly what it is, then you have to know how energy is transferred between the two!
An open system can interact with both matter (say liquid) and energy with the surrounds. For example, you can pour in water and change the volume of an open system, or you can place your hand on it and transfer heat.
A closed system can only transfer energy, say through heat again by touching it.
An isolated system can have no interactions with either matter or energy, which is sometimes called isothermic. A good example could be a hydroflask wrapped in a very good insulator or a bomb calorimeter.
Hope this helps :)

Jchellis 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

### Re: Systems

More examples could be a cup (open), a jar (closed), and a cooler (insulated).

Xingzheng Sun 2K
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

### Re: Systems

Simply, an open system means both matter and energy can exchange; A closed system can exchange energy but not matter. An isolated system does not exchange either matter or system.

Desiree1G
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

### Re: Systems

Open you can think of it as if something can fall out of it, hence it can exchange heat and matter. Like a plant, it is exposed. Closed well nothing can fall out, but heat can still be exchanged. Isolated nothing is exchanged because it is isolated away from everything.

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

### Re: Systems

Open systems: Exchange both matter and energy with the surroundings
Closed systems: Exchange just energy
Isolated systems: Neither heat nor matter can be exchanged