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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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From what observation does 0 law of thermodynamics come from? |
When 2 objects are separately in thermal equilibrium with a third object, they are also in thermal equilibrium with each other. |
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What is thermal equilibrium? |
No heat transfer occurring |
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Why is this law so important? |
Because it affects the measurement of temperature. |
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What does first law of thermodynamics say? |
Energy can neither be created or destroyed but only transformed from one form or another. |
Law of conservation of energy |
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What are 2 mechanisms of transfer of energy? |
Work or heat |
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All objects have internal energy U, e.g we store energy from food and lose it as heat, what does this expression mean: ∆U = q(in)+w(on) |
Q(in) is heat, Q can be positive or negative depending on the heat transfer in our out, w(on) is work |
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My molecules have internal energy? |
They are stored in bonds in the form of vibrational energy. |
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What is enthalpy? |
Energy change considering work |
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What is pressure and work? Combining the 2 equations what do you get do work out work performed by an expanding gas? |
Pressure= force/area Work=force × distance W= p∆V Therefore energy leaving the system and w(on) = -p∆V |
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