Dashboard / My courses / PHYS1121-PHYS1131-PHYS1141-5243_00324 / Week 8: Ideal Gas Law Online Lab
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QUIZ
In the second part of this experiment we are going to take the gas in the syringe through a cycle.
Use this video:
https://youtu.be/dDZ6SYlBYJ4
And data downloaded here (a .txt le, you may want to analyse it in excel) to complete the table and
answer the questions.
 
Question 7
Not complete
Marked out of 3.00
Complete this table
Results: Adiabatic, isovolumentric and isothermal process
    Pressure (kPa) Volume (mL) Temperature ( C) Temperature (K)
  1   Initial 40
  2  
Maximum
pressure and
temperature
21  
  3  
Equilibrium
with surrounds
21    
  4   Final 39.5  
Now it is time to analyse your results.
Which path 1->2, 2->3 and 3->4 are closest to an adiabatic compression, isothermal expansion and
isovolumetric process? Complete the table below:
Path 1->2 2->3 3->4
Process name (No answer given)   (No answer given)   (No answer given)  
Start by analysing the isothermal expansion.
Write down (as a formula derived from the Ideal Gas Law) the relationship between pressure and
volume in an isothermal expansion.
constant = 
Now consider the adiabatic compression. This is from the initial conditions until the maximum pressure
and temperature have been reached.
Write down the expression for the relationship between P and V for the adiabatic compression of air
(model air as a diatomic molecule). You should not include T in this expression. Recall, γ=(f+2)/f,
substitute in a correct value for f.
constant = 
Find , and for each of the three paths. Some hints from the lab manual are shown
below. Use .
Complete this table for the three paths:
Path 1->2 2->3 3->4
Q (J) 0    
o
W (J)        
ΔE (J)         
Check
int