When a fluid - a gas or a liquid - flows in a conduit - a pipe - of uniform cross-section - the pressure in the pipe is so much and the velocity of flow is so much. If now the fluid encounters a constriction in the pipe - a narrow-ness - TWO REMARKABLE THINGS OCCUR:

The velocity is increased The pressure is diminished

These remarkable events tell us how an airplane can fly - how a bird can soar -how a chimney has a good draft - how a flag flutters and a thousand other things. We show an array of exciting DEMONSTRATIONS bearing out these matters.



A - Two heavy croquet balls hang side by side with a little gap between.

When a stream of air is blown between them they are PUSHED TOGETHER by the greater pressure on their outer sides.



B - When a stream of air is blown across the top of a "chimney" - a vertical glass tube - the reduction in pressure is felt in the chimney and the atmospheric pressure outside drives the "soot" - the puffed rice -up the chimney. This is the principle of the atomizer.



C - When a ball is lodged in a funnel and the air is driven stoutly into the

funnel the ball is NOT driven out! This appears quite illogical until we think of Bernoulli's Principle.



D - Using a large-scale atomizer tube we blow a stream of air across the top of the spout of a closed tin can. The reduction in pressure is felt in the can. The atmosphere crushes the can! Very very dramatic!



E - A ball is supported on a vertical stream of air. We say the air pushes up -the ball pushes down. Now we deliver the stream of air off the vertical. The ball does not fall down! The secret? The ball is given a spin. This gives rise to a diminution in pressure on the UPPER side of the ball where¬upon the atmosphere below holds up the ball! Wonderful!



F - This phenomenon is demonstrated with a Toy Car.

The Bernoulli Family has had no likeness in all of history. There were over 120 bearing this illustrious name - and all were uncommon men - nearly all geniuses!

In their youngest years they showed remarkable intellectual competence in every body of knowledge - .mathematics - science - languages - philosophy medicine. An incredible thing!

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.