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keith river
- 15
- 0
Is log (no of molecules) a state variable? I know that the no of molecules are a state variable so I assume the logarithm of this is still a state variable. Am I right?
Thermodynamic state variables are physical properties that describe the state of a thermodynamic system at a given time. These variables include temperature, pressure, volume, and internal energy.
Thermodynamic state variables describe the state of a system at a given time, whereas thermodynamic processes describe how a system changes from one state to another. State variables remain constant during a process, while process variables, such as work and heat, change during a process.
Some state variables, such as temperature and pressure, can be measured directly with instruments. However, other state variables, like internal energy, cannot be directly measured and must be calculated using other state variables and thermodynamic principles.
The first and second laws of thermodynamics are based on the concept of thermodynamic state variables. The first law states that energy cannot be created or destroyed, only transferred or converted between different forms. The second law states that the total entropy of a closed system will never decrease.
Thermodynamic state variables are crucial in understanding and predicting the behavior of thermodynamic systems. They are essential in the design and analysis of engines, power plants, and other energy systems. They also play a significant role in fields such as chemistry, physics, and materials science.