3/3/15 ideal gas law

We heat a can that contains water to boiling, and found that the can implode fast

This is the prediction of the lab shown in the video. we think it implode slowly cause we thought only bottom part hit the water.

Same experiment, but this time we remove the water, and found that it hardly implode but suck some water.

This is the prediction of the experiment.

We did a experiment to find the relationship between volume and pressure, and we got a inverse function between pressure and volume.

This is the experiment we did to find relationship between pressure and temperature. We make the volume as a constant.

This graph is the prediction we make for the relationship between pressure and temperature.

After we fix it, we found that when volume is constant, pressure and temperature has a linear function relationship.

This is the equipment set to measure the relationship between volume and temperature. The video is too large so I can't upload it. We use room temperature water, hot water and warm water to change the temperature and record the volume change.

This is the prediction we make before the experiment

After we collect the data, we found that a linear function best fit the graph, which confirm our prediction

After we have the law: pv = nRT, we rewrite the formula and got another expression of the gas constant R. 

This question apply the ideal gas law, which practice to figure which element is equal and set up the equation.

This is the solution for the problem. We found that the gas constant is not always needed. We can treat nR as a constant as long as we make sure that there is no more air filled in or leaking.

This is the last experiment. Another similiar experiment is same but the material is cotton candy. As we let the air come out, the balloon gets larger due to the pressure out side balloon gets smaller but the pressure inside and outside have a tendcy to be equal, which makes balloon gets larger.