Lab 3: Gas Laws and First Law

  There was a can contained a litter of water. We heated the can and then put it into the ice water. Before the experiment, our prediction was the can will implode immediately after we put it into ice water.

  First, we heated the can:

  Second, we put this hot can into ice water:

  The can was implode after we put it into ice water which matches our prediction.

  We heated another can with no water in it and put it into ice water. But the can did not change and it suctioned water this time.

  These are seven units for pressure and atmosphere pressure we found:

  We started Boyle's Law experiment by ourselves. We were using Logger Pro to drew a volume vs. pressure graph for a syringe that it's volume changing from 6cc to 20cc.

  Then we started Gay-Lussac's Law. This is our prediction graph:

  Professor started heating the flask.

  He put this flask into ice water first:

  And then he put it into hot water:

  Last, he put the flask into room temperature water:

  These are the temperature vs. pressure graphs:

  Last, we started Charles' Law:

    These are temperature vs. volume graphs:

  The ratio of kb and r (Avogadro's Number):

  This is an example question that Professor gave us to solve:

  We started a balloon experiment. We put a balloon into a vacuum chamber and drew out the air.

  As you see, the balloon is getting bigger and bigger because outside balloon pressure is decreasing when we drew out the air.

  Then we started a marshmallow vacuum chamber demo. Same condition, drew out the air from the chamber. The marshmallows were expand first and then shrink after air releasing.

  Here is another problem that Professor gave us to solve:

  In conclusion, we did many interesting experiments today. Now we know a hot can will shrink after put it into ice water. We did three different law experiments -- Boyle's Law, Gay-Lussac's Law and Charles' Law. pv=nrt is a important equation need us to remember. We also found out the Avogadro's Number 6.02* 10^23. Last, we need balloon and marshmallows' vacuum chamber demos. The balloon and marshmallows were expand when air was pulling out.