Thermometric Properties and Processes 
Thermometric Properties and Processes
by Prof. Miller
Video Lecture 17 of 46
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Date Added: February 5, 2015

Lecture Description

We ask: By what physical properties or processes can we investigate the nature of HEAT and TEMPERATURE? What does NATURE do to demonstrate changes in temperature?

A. Expansion is a thermometric process. Evidence: a mercury-in-
glass thermo-meter — note the spelling! - shows an expanding
length of mercury column when the thermometer is immersed in
hot water - say.

B. Electrical Resistance is a thermometric property. We show a coil
of wire connected in series with an automobile lamp and a car battery. At room temperature the coil resistance is such that the lamp
lights at normal brightness. If now we put some ice - or "dry ice"
- solid CO2 - on the coil - the lamp lights brighter. On the
other hand if we heat the coil with a flame the light goes dimmer.
The mathematical expression for the behavior of a coil - of a metallic conductor - is this:
Rt = Ml +c^) where «C is called the temperature coefficient of resistance. For most metallic conductors this has the value 0.00366 - which comes out to be very nearly 1/273. This reveals that the electrons in a wire behave very much like the molecules In a gas! A very exciting thing to discover!

C. Magnetism is a thermometric property. If a bar of magnetic material
- iron - say - is held by a magnet and the bar is heated - the
magnetic forces get less. Roughly speaking this suggests the follow¬
ing: A magnetized sample of stuff implies an orderly arrangement of
the elementary parts. When heated a state of disorder arises.

D. Thermoelectric "power" is a thermometric process. If we connect
any two different wires and have their junctions at different temperatures a difference of potential arises and an electric current
ensues. We show an array of thermocouples - one whose scale is
thermometric - that is - it reads in degrees.

E. Color is a thermometric property. If we lay out on a clean fresh snow bank an array of colored sheets of paper - in the full sun -we see an astonishing thing: the paper sinks in the snow - mean¬ing of course that the snow is being melted underneath. And the different colored sheets sink at different rates.

Course Index

  1. The Idea of the Center of Gravity
  2. Newton's First Law of Motion: Inertia
  3. Newton's Second Law of Motion: The Elevator Problem
  4. Newton's Third Law of Motion: Momentum
  5. Energy and Momentum
  6. Concerning Falling Bodies & Projectiles
  7. The Simple Pendulum and Other Oscillating Things
  8. Adventures with Bernoulli: Bernoulli's Principle
  9. Soap Bubbles and Soap Films
  10. Atmospheric Pressure
  11. Centrifugal Force and Other Strange Matters
  12. The Strange Behavior of Rolling Things
  13. Archimedes' Principle
  14. Pascal's Principle: The Properties of Liquids
  15. Levers, Inclines Planes, Geared-wheels and Other Machines
  16. The Ideas of Heat and Temperature
  17. Thermometric Properties and Processes
  18. How to Produce Heat Energy
  19. Thermal Expansion of Stuff: Solids
  20. Thermal Expansion of Stuff: Gases & Liquids
  21. The Strange Thermal Behavior of Ice and Water
  22. Heat Energy Transfer by Conduction
  23. Heat Energy Transfer by Convection
  24. Heat Energy Transfer by Radiation
  25. Evaporation, Boiling, Freezing: A Dramatic Adventure
  26. Miscellaneous Adventures in Heat
  27. The Drama in Real Cold Stuff: Liquid Nitrogen
  28. The Physics of Toys: Mechanical
  29. The Physics of Toys: Acoustic and Thermal
  30. Waves: Kinds of Properties
  31. Sound Waves: Sources of Sound & Pitch and Frequency
  32. Vibrating Bars and Strings: The Phenomenon of Beats
  33. Resonance: Forced Vibrations
  34. Sounding Pipes
  35. Vibrating Rods and Plates
  36. Miscellaneous Adventures in Sound
  37. Electrostatic Phenomena: Foundations of Electricity
  38. Electrostatic Toys, Part 1
  39. Electrostatic Toys, Part 2
  40. Adventures with Electric Charges
  41. Adventures in Magnetism
  42. Ways to "Produce" Electricity
  43. Properties and Effects of Electric Currents
  44. Adventures in Electromagnetism
  45. Further Adventures in Electromagnetism
  46. Miscellaneous and Wondrous Things in E&M

Course Description

Demonstrations in Physics was an educational science series produced in Australia by ABC Television in 1969. The series was hosted by American scientist Julius Sumner Miller, who demonstrated experiments involving various disciplines in the world of physics. The series was also released in the United States under the title Science Demonstrations.

This program was a series of 45 shows (approximately 15 minutes each) on various topics in physics, organized into 3 units: Mechanics; Heat and Temperature / Toys; and Waves and Sound / Electricity and Magnetism.


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