Absolute Temperature and the Ideal Gas Law

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SUMMARY

The discussion revolves around calculating the new temperature of air in a cylinder using the Ideal Gas Law, specifically the equation P1V1/T1 = P2V2/T2. The initial conditions include a volume (Vi) of 4.50 x 10^-2 m^3, a temperature of 30°C (303 K), and atmospheric pressure (101 kPa). After compression to one-ninth of the original volume (0.111Vi) and an increase in pressure to 20.0 times the original (2020 kPa), the new temperature was calculated to be 673 K or 400°C.

PREREQUISITES
  • Understanding of the Ideal Gas Law and its components (pressure, volume, temperature).
  • Ability to convert temperature from Celsius to Kelvin.
  • Basic algebra skills for manipulating equations.
  • Familiarity with unit conversions, particularly pressure (kPa) and volume (m^3).
NEXT STEPS
  • Study the Ideal Gas Law in detail, focusing on real-world applications.
  • Learn about the significance of absolute temperature in thermodynamics.
  • Explore advanced gas laws, including the Combined Gas Law.
  • Investigate the effects of compression on gas behavior in engines.
USEFUL FOR

This discussion is beneficial for students studying thermodynamics, engineers working with internal combustion engines, and anyone interested in the practical applications of the Ideal Gas Law.

liz_p88
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Homework Statement



A cylinder in a car engine takes Vi = 4.50 x 10^-2 m^3 of air into the chamber at 30°C and at atmospheric pressure. The piston then compresses the air to one-ninth of the original volume (0.111Vi) and to 20.0 times the original pressure (20.0 Pi). What is the new temperature of the air?

Homework Equations



P1V1/T1 = P2V2/T2

The Attempt at a Solution



I know I am supposed to convert my pressure and temperature to different numbers but I simply do not know what I am supposed to do. Please help!
 
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I figured it out.

(101 kPA)(.045 m^3)/303k = (2020 kPA)(.004995 m^3)/T2

673k or 400°C
 

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