# Thermodynamics(math) derivation step

• iScience
In summary, the equations of thermodynamics can be derived using mathematical principles such as calculus and statistical mechanics. The derivation steps are significant because they provide a rigorous mathematical basis for understanding thermodynamic principles and allow for quantitative predictions and calculations. Assumptions are made during the derivation, such as assuming equilibrium and a closed system. These steps can be applied to most systems, but may not be applicable to extreme conditions. The derived equations can be used to solve real-world problems by applying them to specific systems and conditions, but they may not always accurately describe complex systems.

#### iScience

hi, i just need help with a step in a derivation in my thermodynamics book (indicated by the red arrow)

http://i.imgur.com/C8k3xzT.jpg

firstly, what's the point of a -(q+N) term if they're just going to cancel it out with a +q and +N?

basically i want to know how the terms inside the 'ln' can come out in front.

## 1. How do you derive the equations of thermodynamics using math?

The equations of thermodynamics can be derived using mathematical principles such as calculus and statistical mechanics. The first law of thermodynamics is derived from the conservation of energy principle, while the second law is derived from statistical mechanics and entropy. The third law is derived from the properties of absolute zero temperature.

## 2. What is the significance of the derivation steps in thermodynamics?

The derivation steps in thermodynamics are important because they provide a rigorous mathematical basis for understanding the principles and laws of thermodynamics. They also allow us to make quantitative predictions and calculations about the behavior of thermodynamic systems.

## 3. Are there any assumptions made during the derivation of thermodynamic equations?

Yes, there are some assumptions made during the derivation of thermodynamic equations. These include assuming that the system is in equilibrium, that there is no external work or heat transfer, and that the system is closed and isolated from its surroundings.

## 4. Can the derivation steps of thermodynamics be applied to all types of systems?

The derivation steps of thermodynamics can be applied to most types of systems, including gases, liquids, and solids. However, they may not be applicable to systems that are highly non-equilibrium or involve extreme conditions, such as black holes.

## 5. How can one use the derived equations of thermodynamics to solve real-world problems?

The derived equations of thermodynamics can be used to solve real-world problems by applying them to specific systems and conditions. This involves identifying the relevant variables, applying the equations, and solving for the desired quantity. It is important to note that these equations are simplified models and may not always accurately describe complex systems in the real world.