Derivative of Pressure/Temperature: Explained

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Discussion Overview

The discussion revolves around the mathematical derivation of the derivative of the ratio of pressure (P) to temperature (T) with respect to time (t). Participants explore the application of calculus rules such as the product rule, chain rule, and quotient rule in this context.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant requests clarification on the derivative of the ratio of pressure to temperature.
  • Another participant points out a missing term on the right-hand side of the equation and mentions the product and chain rules.
  • A different participant expresses uncertainty but shares their attempt using the quotient rule, providing their derived expression.
  • One participant suggests a specific form for the derivative of the natural logarithm of temperature, indicating the use of the chain rule.
  • Another participant acknowledges their need to become more familiar with the chain rule, noting their limited exposure to it in previous calculus classes.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct approach to the derivative, as multiple methods are proposed and some uncertainty remains regarding the application of calculus rules.

Contextual Notes

There are indications of missing assumptions and potential misunderstandings regarding the application of calculus rules, particularly the chain rule and its implementation after the product rule.

racnna
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can someone please explain this?

[tex]\frac{d}{dt} \frac{P}{T}=\frac{1}{T} ( \frac{dP}{dt}- \frac{dlnT}{dt})[/tex]
 
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im not sure...

but i just tried quotient rule and it worked out?...
[tex]\frac{d}{dt} \frac{P}{T}= \frac{T \frac{dP}{dt}-P \frac{dT}{dt}}{T^2}=\frac{1}{T} \frac{dP}{dt} - \frac{P}{T^2} \frac{dT}{dt}[/tex] ...etc.
how exactly do you implement chain rule after you use product rule? i would like to know. thanks in advance!
 
Last edited:
ooooh, it's T-time! :-p

chain rule …

d(lnT)/dt = d(lnT)/T dT/dt :wink:
 
thanks!...i need to get used to using the chain rule...we never really used it much in my calculus classes from back in the day...
 

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