- In our school lab as a group we have done specific measurements to prove how pressure and volume are related (according to Boyle-Marriot law, explained below). Using this apparatus:
The apparatus on top is used by this way: you pull the top handle until the black part (which is inside the container) and then you put the red handle (which is at the right, jus beside the indicator of the pressure) at the ways that no air can get in or out. gradually you push the top handle, stoping when therearetwo or three ml than befor and you record the pressure that the indicator tells us.
These are some members of our group writting downthe data that we found out through this experiment.
-Our table, graph and results:
This graph represents our study in the lab about the relationship between the volume and the pressure of a gas in a container. With an specific instrument we took a container with 65 ml of volume and we placed the pressure at 0, then we started to decrease the volume, so the pressure increases, as we were reducing the volume the pressure was increasing and we record the data so we can make a reliable graph.
Boyle-Marriot law
This image represents the Boyle-Marriot law, that consists in the following: when the volume of the container decreases, the pressure increases. The graph beside the animation that moves up and down in an exponential way, tells us that the way the pressure increases is inversely proportional to the way the volume decreases. There is a simple form of proving it, you take the measurements of a volume and its respective pressure, and you multiply it, then you take another measurement of a different volume with its different pressure and multiply also these ones, the result would be the same (P1 x V1 = P2 x V2), because one increases while the other one decreases.
The formula to calculate the Boyle-Marriot law is this one:
VP = k
Conclusion
When volume is reduced, the pressure is increased, this is because the particles of the gas get squashed: the same number of particles are put in gradually less space, so the particles are nearer to each other, increasing also the density of the gas. This conclusion fits perfectly with Boyle-Marriot law.
WORK DONE IN SAN FRANCISCO DE PAULA SCHOOL CHEMISTRY LAB
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