LAB VISIT by María Gallego García and Coral Conde Velasco 10B


Materials:
Method:
We used a pressure-volume meter and observed it, we made our own hypothesis about how it worked.
Then, we wrote all the results, made some graphs and tables and wrote down our own conclusions. It has been a nice and curious experiment!

pressure-volume meter

As we can see, there is a tube where we can see the volume of air (O2 and other gases) that we change by moving a roller handle.

There is also a thermometer, showing the temperature and a device that measures the pressure.

The lower the volume, the higher the pressure. This is because the same amount of air is compressed in a determined volume. We can change the volume (so it is the independent variable), and when volume changes pressure does too (so it is the ). In higher pressure, the same amount of air will be compressed in a lower space or volume. They have an inversely proportional relationship.

Afterwards, we turned the handle so that the volume was at its maximum point: 60 mL. After this, we closed it (turning the red thing you can see in the picture). So there we had all the air we were going to have. We wrote down the volume (which was 60 mL) and the pressure. We started to turn the roller handle, so the volume in which the air was smaller and smaller each time. We wrote this pressure in certain values for the volume in mL (60, 55, 50, 45, 40, 35, 30, 25 and 20).
Then, we wrote all the results, made some graphs and tables and wrote down our own conclusions. It has been a nice and curious experiment!
These results are shown in the next post.