Entropy change as mass tends to infinity

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SUMMARY

The discussion focuses on the behavior of entropy change as mass approaches infinity, specifically in the context of thermodynamics. It establishes that the entropy change formula, given by ΔS = mc ln(Tf/Ti), tends towards ΔQ/Ti when mass becomes infinite, effectively transforming the object into a heat bath. The participants explore the implications of this limit and how the ratio Tf/Ti behaves as mass increases, particularly when Tf is expressed as Ti + dT.

PREREQUISITES
  • Understanding of thermodynamic principles, particularly entropy.
  • Familiarity with the formula for entropy change: ΔS = mc ln(Tf/Ti).
  • Knowledge of limits and behavior of functions as variables approach infinity.
  • Basic grasp of temperature variations in thermodynamic systems.
NEXT STEPS
  • Research the concept of heat baths in thermodynamics.
  • Study the implications of entropy in large systems and statistical mechanics.
  • Explore the mathematical treatment of limits in calculus.
  • Investigate the relationship between temperature changes and entropy in thermodynamic processes.
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Students and professionals in physics, particularly those specializing in thermodynamics and statistical mechanics, as well as anyone interested in the mathematical aspects of entropy and heat transfer.

blueyellow
'show that the entropy change of the object tends towards deltaQ/T (subcript i) as its mass tends to infinity, in the4 limit where it becomes a heat bath

i got:
change in entropy =mc ln (Tf/Ti) (mc ln (T subcript f/T subcript i))

but if the mass tends to inifinity the expression seems to blow up

thanks in advance
 
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blueyellow said:
'show that the entropy change of the object tends towards deltaQ/T (subcript i) as its mass tends to infinity, in the4 limit where it becomes a heat bath

i got:
change in entropy =mc ln (Tf/Ti) (mc ln (T subcript f/T subcript i))

but if the mass tends to inifinity the expression seems to blow up

thanks in advance
As the mass increases what happens to Tf/Ti?

Let Tf = Ti + dT where Ti is very close to Tf.

Express the change in entropy in terms of Ti and dT.

AM
 

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