Thermodynamic Properties: Why We Need Them & How to Calculate

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In summary, extensive properties in thermodynamic systems are important because they help to characterize the system and determine specific values of thermodynamic properties such as specific heat capacity. Density, on the other hand, is an intensive property and does not change with the amount of substance present in the system.
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manimaran1605
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Why should we bother about Extensive properties in Thermodynamic systems? and
Why do we need specific value of some thermodynamic property? and
what does it tell us about the system? Eg. specific heat capacity?
How density of a thermodynamic system is a intensive property?
 
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It's hard to answer your questions because they are not very specific. What is it exactly you don't understand?

manimaran1605 said:
Why should we bother about Extensive properties in Thermodynamic systems?
Why not?

manimaran1605 said:
Why do we need specific value of some thermodynamic property?
Because they characterise the system?

manimaran1605 said:
what does it tell us about the system? Eg. specific heat capacity?
For instance, how can you calculate how much energy is needed to heat one kg of water from 20°C to 30°C if you don't know its heat capacity?

manimaran1605 said:
How density of a thermodynamic system is a intensive property?
Take two systems, one being 1 kg of water at SATP, the other 2 kg of water at SATP. Is the density different?
 
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see: "Extensive Quantities in Thermodynamics" DOI= 10.1088/0143-0807/35/3/035017 (published in 2014)
 

1. What are thermodynamic properties?

Thermodynamic properties are characteristics of a substance that describe its state and behavior under different conditions, such as temperature, pressure, and volume. These properties include entropy, enthalpy, specific heat, and heat capacity.

2. Why do we need thermodynamic properties?

Thermodynamic properties are necessary for understanding and predicting the behavior of substances in various systems, such as chemical reactions and phase changes. They also play a crucial role in engineering and designing efficient processes and systems.

3. How are thermodynamic properties calculated?

Thermodynamic properties can be calculated using equations derived from the laws of thermodynamics, such as the first and second laws. These equations take into account factors such as temperature, pressure, and volume, and can be solved using experimental data or through theoretical calculations.

4. What are some common methods for measuring thermodynamic properties?

Some common methods for measuring thermodynamic properties include calorimetry, which measures heat transfer in a system, and thermogravimetry, which measures the weight change of a substance as it is heated or cooled. Other techniques include differential scanning calorimetry, thermal conductivity measurements, and gas chromatography-mass spectrometry.

5. Can thermodynamic properties be changed?

Thermodynamic properties are inherent characteristics of a substance and cannot be changed. However, they can be affected by external factors such as temperature and pressure. For example, the specific heat of a substance may change with temperature, but the specific heat itself is a constant property.

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