Page 1 of 1

### Open vs Isolated System

Posted: Wed Jan 29, 2020 8:51 pm
What keywords would help you determine whether a system is closed or isolated? I find the two very similar and am having difficulty differentiating them when looking at examples.

### Re: Open vs Isolated System

Posted: Wed Jan 29, 2020 8:53 pm
An isolated system is a closed system that is insulated. Anything that has to do with bomb calorimetry is referring to an isolated system.

### Re: Open vs Isolated System

Posted: Wed Jan 29, 2020 9:07 pm
If the system does not exchange matter or energy with its surroundings, it is isolated.

### Re: Open vs Isolated System

Posted: Wed Jan 29, 2020 11:26 pm
Open: can exchange matter and energy
Closed: can exchange only energy
Isolated: can not exchanged anything

### Re: Open vs Isolated System

Posted: Thu Jan 30, 2020 7:31 pm
You can also think of it on a physical level -

open: literally open to pass energy in between system and environment (open-flask experiment etc)
closed: physically closed (with a lid or piston) but clear to see that elements such as heat can still pass in and out of reaction
isolated: physically closed AND doesn't let anything go to the environment (calorimeter is usually a good indicator of this, or if it says "insulated")

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 6:49 pm
I ask myself: can energy leave or enter? Can matter leave or enter?
By answering these, you can find if it is open (yes/yes), closed (no/yes), or isolated (no/no).

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 7:36 pm
Closed you can exchange with whats inside, while isolated you can't exchange at all.

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 7:52 pm
In a closed system, energy can be exchanged with its surroundings while matter cannot. In an isolated system, neither mass nor energy can be exchanged with the surrounding universe.

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 10:28 pm
In a closed system, energy cannot be transferred to the outside.

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 10:33 pm
words like "insulated" or "no exchange" or "closed to the environment" or any other words that indicate the system does not exchange matter or energy would be strong indications that the system is isolated, whereas words that indicate the system is able to exchange energy and matter would be strong signs that the system is an open system.

### Re: Open vs Isolated System

Posted: Sat Feb 01, 2020 10:42 pm
it's isolated if energy cannot be exchanged with the surroundings thus, if the system is insulated it is often isolated.

### Re: Open vs Isolated System

Posted: Sun Feb 02, 2020 3:51 pm
Energy can be transferred in a closed system while in an isolated system energy can't be transferred.

### Re: Open vs Isolated System

Posted: Sun Feb 02, 2020 8:47 pm
An isolated system has no contact to the surrounding environment while a closed system does but is not so affected by it.

### Re: Open vs Isolated System

Posted: Sun Feb 02, 2020 9:28 pm
An open system can exchange matter and energy with its environment, a closed system can exchange only energy with its environment, and an isolated can not exchanged anything with its environment.

### Re: Open vs Isolated System

Posted: Sun Feb 02, 2020 9:43 pm
An open system allows matter and energy to leave (or enter). For example, a cup of tea would be an open system because matter is leaving (i.e. water in the form of gas) and energy is leaving (i.e. the heat is leaving from the tea into the surroundings).

A closed system does not allow matter to leave (or enter), but energy can leave (or enter). For example, a closed bottle of water would be a closed system because matter cannot enter or leave (i.e. water cannot escape the bottle of water as vapor or as a liquid). Energy can be gained (e.g. a cold bottle of water can warm up over time) or leave (e.g. the bottle of water loses heat).

### Re: Open vs Isolated System

Posted: Sun Feb 02, 2020 10:34 pm
Also, the first law of thermodynamics states that the internal energy of an isolated system is constant. This would not be true for an open system where the system can exchange both matter and energy with the surroundings.