Boyle's Law Lab

Ally Schleicher and Keah Dixon

OBJECTIVE AND BACKGROUND INFORMATION

The objective of this experiment is to determine the relationship between pressure and volume. The gas that was used in the lab was air, and it was confined in a syringe which was connected to a Gas Pressure Sensor. When the volume is changed by moving the piston of the syringe, a change occurs in the pressure collected. It is assumed that temperature will be constant throughout the experiment. After you have completed the experiment, you should be able to determine the relationship between volume and pressure. The relationship found between pressure and volume was first noticed by Robert Boyle in 1662 and was later named Boyle's Law.

MATERIALS

The materials you need to complete this experiment are a computer, 20 mL gas syringe, Logger Pro, Vernier computer interface, and a Vernier Gas Pressure Sensor.

PROCEDURE

1.) Prepare the Gas Pressure Sensor by plugging it into Channel 1 of the computer interface. Move the piston of the syringe to the 10 mL mark. Then, attach the 20 mL syringe to the Gas Pressure Sensor.

2.) Open Logger Pro and open the file "06 Boyle's Law" from the Chemistry folder.

3.) To obtain the most accurate data possible, you need to correct the volume readings from the syringe. To account for the extra volume in the system, add 0.8 mL to the syringe readings.

4.) Click COLLECT.

5.) Collect the pressure vs. volume data. It is best for one person to take care of the gas syringe and for another to operate the computer. Move the piston to the directed points after hitting keep to keep your information. Use the points 9.0, 11.0, 13.0, 15.0, 17.0, and 19.0 mL. Click stop when you have finished collecting data.

6.) Record the data for pressure and volume in pairs as displayed in the table.

7.) Examine the graph of pressure vs. volume and determine what type of relationship pressure and volume share. Choose a curve that best fits the graph.

8.) Once you have confirmed the graph to be correct, print a copy off with the best curve displayed.

9.) With the best curve fit still displayed, proceed directly to the Processing the Data section.

RESULTS AND QUESTIONS

The results of this experiment proved that pressure and volume have an inverse relationship.

Questions:

1.) The pressure with half itself if the volume doubles. When one increases, the other will decrease. This is called an inverse or indirect relationship.

2.) When the volume is halved from 20.0 mL to 10.0 mL, the pressure will increase by 2 (x) times.

3.) If the volume is tripled, the pressure will decrease exponentially.

4.) Pressure and volume have an inverse relationship. When you look at the data table below, you can see that when volume increases, the pressure decreases. This is an example of an inverse or indirect relationship.

5.) If the volume in the syringe was 40 mL, the pressure would be very low, around 10 to 20 kPa (just looking at the data). As Boyle's Law states, volume and pressure have an inverse relationship so as volume increases, the pressure will decrease.

6.) If the volume in the syringe was lowered to 2.5 mL, the pressure would be very high.

7.) The temperature was never changed and the type of gas was never changed. The temperature remained constant throughout the experiment, never changing unless the air conditioning was on. (I don’t believe it ever started during our class period). The type of air in the syringe never changed. The air was never released or exposed to different air because it was connected to the Gas Pressure System the entire time.

8.) Inverse relationship means that as one variable goes up, the other goes down. (As pressure increases, you can infer that volume will decrease.)

9.) From the data, we can infer that Boyle's Law is an inverse relationship. At point 5.8, the point is very high because the pressure is high (165.62) while the volume is low. At point 19.8, the volume is very high while the pressure is very low (53.62).

10.) Boyle's Law is a law stating that pressure and volume are inversely related. This means that when pressure is high, the volume will be low and when the volume is high, the pressure will be low. The temperature has to be constant for this law to work and cannot be frequently changing. (Tires during the winter become lower and inflate back up again in the summer.)

11.) I used the Developing and Using Models during the lab. I had to be able to create a model of Boyle’s Law on Logger Pro and then I later had to use that model to answer questions from the lab. I created the graph on my computer and my group members had to tell me what to do with the graph. Information was collected from the syringe and the Gas Pressure System into the computer, and as a group, we could use this information to answer the questions provided.

12.) Patterns is one of the Clear Cutting Concepts that was used in the lab. I had to be able to notice the pattern which lies in Boyle’s Law: pressure vs. volume. Pressure and volume have an inverse relationship; when one variable increases, the other variable decreases. From the graph, at 5.8 mL, the pressure is high (165.62) while at 19.8 mL, the pressure is low (53.62).

OBSERVATIONS

The observations that I made include: finding the relationship between pressure and volume and observing how temperature needs to be constant and cannot change. Temperature affects pressure (changing seasons causes changing air pressures. Because of this, many babies are born when the air pressure changes like a severe rain storm or a blizzard).

CONCLUSION

I have concluded that the relationship between pressure and volume is an inverse relationship. This means that if pressure is high, the volume must be low and vice versa. This can be connected to real life: tire pressure during the winter is usually lower than it is in the summer. The changing pressures and temperatures when switching seasons can change the pressure in your tire. During the winter, the pressure will be lower in the tire and you may have to add more air to the tire. In the summer, the pressure will be greater than what it is in the winter and you don't have to add as much air as you should in the winter to keep a correct tire pressure.