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Introduction. Lab No.6: Determination of adiabatic constant

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Lab No.6: Determination of adiabatic constant

Mussabekov Daniyar

IT department, International IT university, Dzhandosov str. 8a, 050040, Almaty

Abstract

We used glass cylinder which connected with pump, to fill it with gas. This devise was needed to determine adiabatic constant of air using Kleman and Dezorm method. Relative error of measurement is calculated using Students method.

 

Introduction

 

This experiment will be occurred by classical method which calls method of Kleman and Dezorm. Initial state of gas is 1, which has such thermodynamic parameters: temperature T1, pressure P1, and specific volume V1. By adiabatic expansion gas comes to state 2 with parameters T2, P2 , V2. After that the system is being heated at constant volume V2 until temperature T3 , which is equal to the initial temperature T1, so at the final state parameters T3, P3 , V3 are equal to parameters of initial state (T1= T3, V1= V3). So the adiabatic constants equation is P1V1γ=P2V2γ

 

With this device, I’ve performed these measurements

Table 1- Readings of the measurements

#
1,6
1,5
1,46
1,53
1,41

 

I’ve used this formula to calculate adiabatic constant

 

 

 
 


The mean value of adiabatic constant is

Standard deviation of this measurement is equal to

 

Absolute deviation is equal to

 
 

 


Where Student coefficient is equal to 2,77 because n = 5 and α = 0,95

Relative error of adiabatic constant is equal to

 
 

 

 


I’ve calculated theoretical adiabatic constant of air using this formula

 
 

 

 


There is slight difference between theoretical and experimental results, but we can neglect it.




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