Boyle’s Law

Hands-On Labs, Inc.

Version 42-0141-00-02 Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report

Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data

tables that should be addressed in a formal lab report. The intent is to facilitate students’

writing of lab reports by providing this information in an editable file which can be sent to an

instructor. Exercise 1: Observing Boyle’s Law

Data Table 1. Calculating Force.

Number of Books Mass of Book

(kg) Acceleration

m/s2 Force

N Pressure

Pa 1 0.536 9.81 m/s2 5.26 N 684.005 Pa 2 1.073 9.81 m/s2 10.53 N 1489.6 Pa 3 1.414 9.81 m/s2 13.9 N 1966.33 Pa 1.780 9.81 m/s 2 17.5 N 2475.6 Pa 9.81 m/s 2 22.93 N 3243.74 Pa 4

5 2.337 Data Table 2. Surface Area.

Diameter of Syringe (mm) 30 Diameter of Syringe (m) 0.03 Radius of Syringe (m) 0.15 Slant Height of Piston (mm) 15 Slant Height of Piston (m) .015 Surface Area of Syringe Tip (m2) 0.0007065 Data Table 3. Volume and Total Pressure.

Number

of Books Volume:

Trial 1

(mL) Volume:

Trial 2

(mL) Volume:

Trial 3

(mL) Average Volume

Vavg

(mL) 1/Average Volume

1/Vavg

(1/mL) 1 58 58 58 58 0.0172 2 58 57 56 57 0.0175 3 57 56 54 55.7 0.0180 4 56 54 51 53.7 0.0186 5 55 53 49 52.3 0.0191 Data Table 4. Scatter Plots.

Average Volume vs. Pressure 1/Average Volume vs. Pressure Data Table 5. Final Calculations.

Atmospheric Pressure (Pa): 15890 Number

of Books Total Pressure (Ptotal) Total Pressure x Average Volume (Ptotal x Vavg) (Pa) (PamL) 1 684.005 Pa 39672.3 2 1489.6 Pa 84907.2 3 1966.33 Pa 109524.6 4 2475.6 Pa 132939.7 5 3243.74 Pa 169647.6 Questions

A. Describe the relationship of pressure versus the volume of a confined gas.

Volume and pressure have an inverse relationship because as the volume of the container

increases, the pressure of the confined gas decreases.

B. Would you expect your experimental results would change if a different gas, such as CO 2,

were used instead of air? Explain your answer.

Yes I would expect that different gases would each have their own effect because the

density of the gases would vary.

C. Use a reliable source to determine the atmospheric pressure at your location (atmospheric

pressure at sea level is 101325 Pa and atmospheric pressure in Denver, Colorado is 84000

Pa). Use the equation below to calculate the percent difference between your experimental

value for atmospheric pressure and the theoretical value (actual atmospheric pressure).

Show all work. What are some possible sources of errors in your experiment? Percent Diffe rence = (Experimental Value - Theoretical Value)

100%

(Theoretical Value) 15890-101325 = -0.843 x 100% = -84.3%

101325 D. As stated by Boyle’s Law, the products PV should equal a constant, k. Did your results of P t ×

Vavg come out approximately the same for k?

No they did not have a constant pressure.