Credits:Physics Laboratory experiments : J. Wilson, C. Hernandezhttp://www.lon-capa.org/~mmp/SERWAY COLLEGE PHYSICS 7E MEDIA LIBRARYLuciano Troilo, inetractive applet in italian
- To determine the coefficients of expansion of several metals.
- To describe thermal expansion and its applications
- To investigate the proportionality relationship between length, L and Temperature, T
- How changes in temperature influence/determine changes in an object’s length
- Be careful when handling the copper/aluminum rods ; they are very HOT
Watch this video to learn how to use the interactive animation and gather experimental data; Use this interactive animation link; Credits, Author: Luciano Troilo
- Turn Heat On
- Click on the Read Temp button 5 times, when the change in length indicator reaches approximately,10, 20, 30,40, 50 micrometers…
- Record the change in length from the analog dial (arc of the circle);The reading is in μm;
- Record the T, temperature; it’s shown in degrees Celsius;
- Use the graphing script link and plot the changes, ΔL, ΔT such that the slope of the graphs represents αexpansion.
- Identify the material, the rod is made of, by using this link and searching for a material that has αexpansion=slopefrom graph
- The relationship between ΔT and ΔL:
1) : ΔL=α⋅Linitial⋅ΔT →Consider the initial length of the rod inside the device/sleeveLinitial= 7.8 cm
- The slope-intercept form for the equation of a straight line is
2) : y= mx bComparing it with the equation 1 above →:
- ΔL is the variable on the y-axis expressed in m
- Linitial⋅ΔT is the variable on the x-axis expressed in units of m⋅0C
- α, the linear expansion coefficient is the slope of the line, m;
- b, the y-intercept =0.
Graphing – vizualizing ΔT, ΔL relationship
- Plot a graph using this link !Plot the Fahrenheit temperature on the y axis and the Celsius temperature scale on the x axis.
The slope will be automatically calculated;Add units for the slopeUpload the graph and the answers to the questions as a jpg file! The upload link is on the interactive graphing page.
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