Energy Change in Processes: Explanations Included

AI Thread Summary
The discussion focuses on the changes in internal energy during various physical processes. It clarifies that during phase changes, such as melting or boiling, internal energy increases despite temperature remaining constant due to the input of heat energy. In contrast, processes like water freezing and a stone falling under gravity do not involve changes in internal energy when temperature is constant. Participants agree that while temperature remains unchanged during phase transitions, the energy input is essential for the change in state. Overall, the conversation emphasizes the distinction between internal energy and temperature in phase change scenarios.
chocofingers
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Could anybody tell whether the internal energy in the below mentioned processes is increasing , decreasing or remains the same!
And please provide explanation as well!

a) water freezing at constant temperature
b) stone falling under gravity in a vacuum
c) water evaporating at constant temperature
d) stretching a wire at constant temperature

What I believe is that it would increase in processes c & d. ?
 
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i might be wrong, but internal energy is dependent on temperature change. If temperature is constant, there should not be any change in internal energy. no?
 
yeah I too thought the same... but during melting internal energy increases ... why?? although the temperature is constant ///
 
chocofingers said:
yeah I too thought the same... but during melting internal energy increases ... why?? although the temperature is constant ///

To change the phase from solid to liquid, it takes an input of energy. This energy only causes the materiel to melt, not to increase in temperature. Once the materiel has liquified, any further energy will cause the temperature to rise again. Same thing happens when it transitions to a gas from a liquid.
 
Drakkith said:
To change the phase from solid to liquid, it takes an input of energy. This energy only causes the materiel to melt, not to increase in temperature. Once the materiel has liquified, any further energy will cause the temperature to rise again. Same thing happens when it transitions to a gas from a liquid.

So it means that during melting,boiling or any such process, internal energy remains constant ?
 
I think what drakkith is saying is, internal energy does increase in melting process as there is an input of heat energy to the substance, however temperature remains constant while melting.
 
okey thanyou, yinx & drakkith... I got it :)
 
thnxz dorebase...
 

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