How Do You Rearrange the Speed of Sound Equation to Solve for M in Gas?

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SUMMARY

The discussion focuses on rearranging the speed of sound equation in gas, represented as v = √[(γRT)/M], to solve for M. The correct rearrangement involves squaring both sides to yield v² = (γRT)/M, followed by multiplying both sides by M and then dividing by v², resulting in M = (γRT)/v². This method ensures accurate isolation of M using algebraic principles.

PREREQUISITES
  • Understanding of algebraic manipulation
  • Familiarity with the speed of sound equation in gases
  • Knowledge of thermodynamic variables: γ (gamma), R (gas constant), and T (temperature)
  • Basic principles of physics related to sound propagation
NEXT STEPS
  • Study the derivation of the speed of sound in different gases
  • Explore the implications of varying γ (gamma) in gas equations
  • Learn about the applications of the speed of sound in engineering contexts
  • Investigate the relationship between temperature and sound speed in various media
USEFUL FOR

Students in physics and engineering, educators teaching thermodynamics, and professionals working with gas dynamics will benefit from this discussion.

cseet
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Hi all,

can you pls show me how you rearrange the speed of sound in gas equation from the original equation of:

v (sound) = sqr of [(gamma * R * T) / M]

I would like to find M, I tried to rearrange it to the following:

M = sq of [(gamma * R * T) / v]

pls kindly correct me with these.

thanks
cseet
 
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cseet said:
Hi all,

can you pls show me how you rearrange the speed of sound in gas equation from the original equation of:

v (sound) = sqr of [(gamma * R * T) / M]

I would like to find M, I tried to rearrange it to the following:

square both sides (in algebra you try to treat each side the same way)

v2 = (gamma * R * T) / M

multiply each side by M (doing the same thing to RHS and LHS is fair)

M * v2 = (gamma * R * T)

divide both sides by v2

M = (gamma * R * T)/ v2
 
thanks marcus

thanks Marcus, you're a gem!
cseet
 

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