Lecture 32: Heat - Thermal Expansion
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008, recorded: December 1999, views: 27479
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
Download mit801f99_lewin_lec32_01.m4v (Video - generic video source 105.5 MB)
Download mit801f99_lewin_lec32_01.rm (Video - generic video source 107.0 MB)
Download mit801f99_lewin_lec32_01.flv (Video 105.9 MB)
Download mit801f99_lewin_lec32_01_352x240_h264.mp4 (Video 147.2 MB)
Download mit801f99_lewin_lec32_01.wmv (Video 432.6 MB)
Report a problem or upload filesIf you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
1. Heat and Temperature:
Various temperature scales are discussed: Celsius, Fahrenheit, Kelvin.
2. Linear Thermal Expansion:
The linear thermal expansion coefficient is introduced. Expansion leads to a need for expansion joints in railroad rails to avoid bulging on hot days. Thermal expansion is demonstrated by heating and cooling a brass rod. An important application of thermal expansion is bi-metals which are used in thermostats, safety devices and thermometers, as demonstrated.
3. Cubical Thermal Expansion:
The fractional change in volume with temperature is given by the coefficient of cubical expansion. A mercury thermometer is discussed.
4. Shrink Fitting:
Shrink fitting is a technique that makes use of the thermal expansion by heating one object (of two). After the two objects are assembled, they cool, and the fit is perfect and "for ever".
5. Cubical Thermal Expansion of Water:
Water has a maximum density at 4 degrees Celsius; between 0 and 4 degrees Celsius the cubic thermal expansion coefficient is negative so the water expands as it cools below 4 degrees Celsius. The density of ice is about 8% lower than water, so ice cubes and icebergs float in water.
Link this pageWould you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !