If a body is submerged in a fluid - a liquid or a gas - the body is buoyed up -lifted up - by a force equal to the weight of the fluid displaced. This is the Classic Principle of Archimedes. We show an array of DEMONSTRATIONS bearing on this Principle.

A - We weigh a body on a spring scale. It weighs "so much" . We now
submerge it in a vessel of water. The scale reads less. How much less? We discover this with another demonstration.

B - We now submerge the body in a vessel so the displaced water runs out a spout. We weigh this water which ran out - which was "pushed" out by the body. And what does it weigh? It weighs EXACTLY the very loss in weight the body experienced when submerged. A wonderful thing.

C - So the water in a vessel pushes up on a body submerged in it. Proof: We push a glass into a tank of water. The glass has a hole in the bottom. The water gushes up through the hole.

D - We show a dramatic demonstration of Archimedes' Principle with THE BUCKET AND CYLINDER.

E - As we all know: some bodies sink in water; others float. When does a body float? When it displaces a weight of water equal to its own weight BEFORE it is completely submerged. Thus it is that some wood sinks - other wood floats.

F - Mercury is fantastic stuff! It is very dense. We all know that steel will sink in water. What will steel do in mercury? Answer: Steel will float in mercury.
We show some exciting things in the Life of Archimedes.
1 - A mosaic depicting his death at the hands of a Roman soldier at the
Siege of Syracuse.
2 - A monument to him showing his Burning Mirror.
3 - The classic discovery of the relationship between the volumes of a
cylinder - a sphere - a cone.
4 - A sphere circumscribed by a cylinder - which is what Archimedes wished to have put atop his tomb.

The Life and Work of Archimedes should be read by every student.

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.