Boyel's Law - Finding Pressure Lab

Finding Pressure Lab

Natalie Speicher

Kutztown Area Senior High School

Abstract

The purpose of this lab was to find the relationship between pressure and volume inside a syringe to prove Boyle’s law. In order to do so, a pressure sensor was placed inside a syringe and a Logger Pro was set up to record the pressure inside the syringe as the volume decreased. Initially starting at a volume of 20mL, the pressure inside the syringe was 101.51mmHg. As the volume decreased, the pressure increased; which proves Boyles Law of which at a fixed temperature pressure and volume are inversely proportional. After 5 trails each decreasing in volume, the syringe was finally at 12mL and 157.17mmHg. At the end of the 5 trials it was proven that 2 X10^3 mL X mmHg was the constant.

Finding Pressure Lab

From previous knowledge about the four gas laws; Boyles, Charles, Ideal, and Guy-Lussac; Boyles law is specifically dealt with in this lab. In this lab the results found proved Boyles law theory that at a constant temperature, volume and pressure will have an inverse proportional relationship. The equation to show this is PxV=K.  After all the trials were completed, the equation was used and the pressure and volume were plugged in and multiplied to find that the temperatures were found constant.

Method

        The materials required to complete this experiment are a GoLink, Pressure Sensor, Logger Pro, syringe, and a MacBook air Laptop. The first step is to set up the laptop to record the pressure given through the Pressure Sensor. The next step is to attach the pressure sensor to the syringe and pull the syringe to 20.0 mL, and start to collect data. Finally, decrease the volume to 16.0, 14.0, and 12.0 mL and record the new pressure.

Results

The results that were found after completing all the trails of the experiment showed that as the volume decreased the pressure increased. In order from trial 1-5 the pressure found for each trial was 101.51, 114.39, 125.74, 138.44, 157.17. After multiplying the volume and pressure of all the trials the constant was found to be 2X10^3mmHg.

Discussion

After recording the results of this lab, it was found that as the volume decreased the pressure increased showing the inverse relationship. The graph that was then recorded showed the inverse relationship because a hyperbola; which is a symmetrical curve. The results simply proved Boyle’s law, that at a constant temperature, pressure and volume will have an inverse relationship.

References

http://www.iun.edu/~cpanhd/C101webnotes/gases/boyleslaw.html

http://mathworld.wolfram.com/Hyperbola.html