Most of the stuff in Nature expands when heated. And we have some wonderful and exciting demonstrations of this. In some cases some enchanting questions arise

A. The classical ball-and-ring demonstration: We have a metal ring
- brass - and a metal sphere - also brass. At room temperature we show that the ball does not go through the ring. So we say the ring is too small OR the ball is too big! Now we heat the ring and presto - the ball now goes through. We say the ring got bigger OR the hole got bigger! We must UNDERSTAND exactly what is going on here!

B. We now have some metal plates - round ones - square ones -
rectangular ones - and in each is a hole - a tiny tiny hole in
some. Now we heat these plates uniformly - as we could do in
an oven - and we ask: What does the tiny hole do? There are
only three cases: The hole does nothing.
The hole gets smaller.
The hole gets bigger. And I leave it as an enchanting exercise for you all to contemplate! I might give a HINT: The ring which we first used in the ball-and-ring demonstration is really a plate with a big hole! Got it now?

C. We have a metal ring - no need to say EXACTLY CIRCULAR. And
this ring has a diameter of its own stuff. We now heat this ring uniformly - as in the oven of my stove. Question: does the ring preserve its circularity or does it warp? Good question! Suggestion!
Those of you who think one thing should try to convince those who
think another! This is real intellectual inquiry.

D. A bimetallic strip consists of two metals fixed to each other along
their length. We heat the strip. Let us say one metal is iron -
the other brass. We see the strip bend. Question: does it bend
toward the iron or toward the brass.
A question for mathematical proof: If both strips are of equal thickness d the straight bimetallic strip will bend into a circle

E. We have two rods - both look like glass. One - we say - IS
glass; the other is quartz. We heat these to red-hot in a flame.
NOTE: while heating we see a color in the flame. Color is a
thermometric process. Then we immerse them both in a beaker of
COLD water. The glass shatters. The quartz does not. The quartz
has a very small temperature coefficient of expansion.

F. We introduce an interesting question: Consider one rail of the RR
track between Los Angeles and San Francisco. Let it be 400 miles
long - in one continuous strip. No breaks. Let this rail suffer an
overall change in temperature of - say 25°C. QUESTION: How
much expansion does this 400-mile rail suffer? ANSWER: Nearly
600 feet! Hard to believe but easy to prove:

G. Why does popcorn pop? A kernel of un-popped corn looks dry -
lifeless - inert - dead! But it is not dry! and it is not dead!
When we heat it the very tiny - very minute - bit of water which
is in it EXPANDS enormously - some 1700 times! The forces are
staggering!

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

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.