Monday, March 9, 2015

Lab 4: Kinetic Theory and PV Diagrams

  We started a quiz today. We were using q=ml and q=mc(Tf-Ti) to find the heat of evaporation and boiling.

  After the quiz, we started the first law of thermodynamic experiment. We figured out the definition of work and two graphs show work equals the area under the curve.



  When we put a flask into the hot water, the volume of the air in the syringe will bigger. But we put the flask into the ice water, the volume of the air in the syringe will smaller.


   After the experiment, we found out the relationship of work, heat and energy.


  There is an example problem for us to solve.


  Then we did an experiment on the computer. These images tell us that atoms will move faster if temperature and pressure are increasing.



2D Molecular Motion activity:
  We found out the speed v of a molecule by using pythagorean theorem. So we found out the equation  v^2=3v_x^2. 

  We found out the equation P=Nmv^2/3V by using p=Nmv_x^2/V and v^2=3v_x^2.


  There is the equation for T.


  Also, we found out a equation for the relationship of V and T.
  

  Isothermal compression of a gas.

  Adiabatic compression of a gas.
  
  This is our final experiment.

  We were trying to found out the final temperature by using the equation Ti^(3/2)Vi=Tf^(3/2)Vf.


  In conclusion, we did a quiz at beginning of the class which is very surprised me. But it is a good problem for us to practice. After the quiz, we did some interesting but hard experiments. All these experiments are hard and a little confused. However, we understood all of them through group discussion.

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