Gas Law. Experiment 1
Title
Gas Law. How does the pressure affects to the volume?
Objective
To determine how the pressure affects the volume of a gas.
Graphs
*The axis, should be the other way round, but there wasn't any other form of representing the data, if it wasn't using this type of graph. The volume should be located at the x axis, while the pressure on the y axis, but we can understand better these graphs, by reading the conlusion below.*
Conclusion
As we can observe on the first graph, while the pressure decreases, the volume increases and viceversa. This is due to, when we increase in the pressure, this forces the molecules of a gas come together, which provoques that the volume is reduced. That it is why the pressure and volume are indirectly proportional.
As we can observe on the second graph, while the pressure decreases, the 1/volume also decreases, and if we compare both graphs we would observe, that when we divide 1/volume, the volume and pressure become directly proportional, while in graph 1, they are indirectly proportional. When pressure is measured, the result should be a straight line whose slope is nRT. Assuming T is constant, the slope will give us n, the number of moles of gas. The linear relationship will break down at low V, where the gas will start to condense.
Boyle-Marriott Law
P1V1 = P2V2
Where P1 is the original pressure, P2 is the pressure after you change it, V1 is the original volume, and V2 is the volume after you change it. This law shows that as volume decreases, pressure increases at a constant temperature, that are the results obtained at our graphs.
In this animation and picture we can observe the Boyle-Marriot Law.
References
- Easycalculation.com (2013). Untitled. [online] Retrieved from: http://easycalculation.com/chemistry/learn-boyles-law.php [Accessed: 29 Nov 2013].
- Wikipedia (2013). Boyle's law. [online] Retrieved from: http://en.wikipedia.org/wiki/Boyle's_law [Accessed: 29 Nov 2013].
We were using the volume of a gas not a liquid and we were investigating the effect of changing volume on the pressure so the volume should have been on the x-axis. Your conclusion is a bit confused but you have identified the actual Law that we were investigating. If your 1st graph was plotted the other way round then the 2nd graph and conclusion would have been a bit easier to do.
ResponderEliminar