## Search found 5 matches

Fri Jan 26, 2018 5:09 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Irreversible vs. Reversible [ENDORSED]
Replies: 10
Views: 736

### Re: Irreversible vs. Reversible[ENDORSED]

The reversible equation is derived from the differential equation for work that uses incremental volume or changes to estimate maximum theoretical work, i.e. how much work would be done if the entirety of heat (q) powers work (w)
Fri Jan 26, 2018 5:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy Question [ENDORSED]
Replies: 3
Views: 180

### Re: Entropy Question[ENDORSED]

As a sample expands to a larger volume, there is more physical space and therefore more possible arrangements of the sample that fit within the space. Entropy is the quantification of this increase in degeneracy, or the number of possible positions.
Fri Jan 26, 2018 5:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Car Engine [ENDORSED]
Replies: 4
Views: 330

### Re: Car Engine[ENDORSED]

Open systems are defined by an exchange of both mass and energy between the system and surroundings. In this case, physical mass is consumed in order to power the machine, while heat is emitted. Car hoods often heat up, showing that coolant systems do not fully insulate the system.
Sun Jan 14, 2018 4:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed vs. Isolated
Replies: 4
Views: 304

### Re: Closed vs. Isolated

Here is the chart our TA showed us in discussion:

Isolated: Heat Transfer [ ] Mass Transfer [ ]
Closed: Heat Transfer [ X ] Mass Transfer [ ]
Open: Heat Transfer [ X ] Mass Transfer [ X ]

Hope this helps!
Sun Jan 14, 2018 4:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Result of Calorimetry Calculations
Replies: 1
Views: 135

### Result of Calorimetry Calculations

When a calorimeter (coffee cup or bomb) is used to calculate heat capacity, is the resulting value for the calorimeter itself or moles of substance present? Essentially, can you divide by the moles or grams of substance to calculate specific heat?