With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Wi-Tricity (Wireless Electricity)
What A Tool Kit Must Consist Of?
As I commented under your Bernoulli video, you work too hard to justify Bernoulli. The pressure is higher in the large section because there is a constriction where the diameter reduces. The pressure in the smaller section is lower because it is free to flow away from the higher pressure region. If you view the smaller section as simply a hole in the pressurized large section (view it as a pressurized tank), the fluid easily escapes out this "hole" to the lower pressure region. It is pressure differences that cause accelerations in a fluid. A higher pressure region represents a force (F) that pushes (accelerates A) the mass (M) of air toward a lower pressure region. F=MA.If you have a gradual change in diameter, the momentum description is not valid.-- Cheers
The majority of these demos are classical misinterpretations of the applicable science as well as Bernoulli's actual Principle. Some of the other comments bring-in many things including math which DOES NOT explain the physics/science.The true physics is not difficult to understand if you can get all these misconceptions out of your mind.Speed of a fluid DOES NOT create a lower pressure. Speed past a surface (or visa versa) does not create a lower pressure. Bernoulli mentions neither of these. If a stream of fast air did have a lower pressure than surrounding air, then, the fast stream would be squeezed narrower and narrower by the higher pressure around it as long as it moved and this simply does not happen. Pressure at a point in a fluid acts in all directions; can't violate that. Therefore, the pressure in the stream (at its outer boundary) pushes out with the same pressure as the atmospheric pressure outside it pushes inward.Paper airplanes (flat balsa wings and Wright Bros wings) have no curved, 'LONGER' upper surface, so this well known bad explanation has a serious problem.The lifting paper and tissue paper/leaf blower are a curved airflow followed by entrainment (from viscosity).This floating ball explanation is messed up. If the pressure was lower UNDER the ball it would not be held up. Then, It is centered by curved airflow.The atomizer (insectide spray) is due to a curved airflow (commonly called "turning" of the air) over the vertical tube's end.The Bunsen burner is due to entrainment (viscosity).The envelope opens because you blow air into it, thus increasing the internal pressure.Air has mass and a force is required to accelerate mass (even air). That force is pressure (difference) and pressure alone. A CURVED AIRFLOW requires a force because this is an acceleration. This force can only be a pressure difference. That pressure difference is from the relative motion of fluid and object.Pressure differences are created DIRECTLY by the relative motion between fluid and object. [no Bernoulli "fast" air, no half venturi pinching, no other false science]. Walk through water and feel how you must push some water around! You create a higher pressure in front of you by pushing on the water (and lower pressure behind by moving away from water). THAT'S WHAT CREATES THE PRESSURE CHANGES.That pressure difference (cause) accelerates water (effect) around you. A higher pressure region accelerates (pushes) air toward any (and all) lower pressure regions. The same thing applies to wings and air: except, to our advantage, the higher pressure is under the wing; lower above. These very same pressure differences then cause all of the the fluid accelerations we see around a wing. Anything else is bad science and violates Newton.This simple concept explains all the air flows around the wing (including the up-wash and down-wash). The air above and below a wing are unrelated and Bernoulli can not be used to compare velocities and pressures. Therefore, saying the upper air is lower pressure because of the difference in speed to the lower air is completely false science and terrible math. Bernoulli deals with accelerations and pressures that occur along a single path (streamline).Again: A higher pressure region accelerates (pushes) air toward any (and all) near-by lower pressure regions. Also, it is the path the air is forced to take by the wing that is what you should focus in, not simply the wing's shape. Finally, (once you fully understand it, it'll be no surprise that) from the siationary air's frame of reference, the fastest moving air around a wing is UNDER it ! This is easily shown on real wings. This blows the "fast-air-has-lower-pressure-than-some-nearby-slower-air" out of the water. That is a serious and long standing misunderstanding by amateurs, but not those in the field.Don't believe me. For a better understanding of the true physics, see these authoritative references:Krzysztof Fidkowski How Planes Flyhttps://m.youtube.com/watch?v=aa2kBZAoXg0 David Anderson:https://m.youtube.com/watch?v=hQ99JkaOwEk Babinsky;https://m.youtube.com/watch?v=XWdNEGr53Gw McLean (though he gets rather heavy later in the video):https://m.youtube.com/watch?v=QKCK4lJLQHURegards, Steve NoskowiczScience & Technical Advisorchallengerillinois.org
hey thanks.. great information :)
How to Make a Siphon Wave Generator
Can this go over 16 feet?
How big is this project
How to Make a Trebuchet
How to make a Ruben's Tube
How to Make A Simple Hydrogen Fuel Cell
How to Make Sound Come Alive - Cymatics
I was reading this and one thing it got my attention >The Wardenclyffe Tower project was a commercial venture for trans-Atlantic wireless telephony and proof-of-concept demonstrations of global wireless power transmission. The facility was not completed because of> insufficient funding.< wrong!! you may read the wrong information about telsa was not insufficient funding is not totally true is because the complication of unlimited energy over the earth with out wired's and the impact in that era in our society would be changed but did not happen not years and decades later when people star to discovery new ways of energy then we try to realize that telsa was rigth
This tube (along with most tubes) is using a propane cylinder.
How to Make An Eco-Friendly Bag
How to Make A Rocket Engine
How to Make A Hovercraft
Be a Detective : Finger Print and Foot Print Capture and Analysis
Hi , what is the website called that you can do your own apps please for free. Thank you
Hi, who did you use please ? Did they help with the building of the app as well ?
Who did you use that can help build and trademark the app ? I believe you said it was free correct ? Thank you
Which type gas used here???
My daughter made this for a school project but the "bag" is hitting the base. Do you know what could be causing this?
How many popstickil sticks do I need
What steps did you follow?
use carbon anode and cathode (you can get it from a zinc carbon battery)
I am 15 and I am doing this as a school project and placing the tube under some type of metal and seeing if this contraption will make bread. If I am doing this what type of metal is preferable that will be safe for what I am doing and also bake the bread.
What is the diameter of the metal tube?
i think the thing you made is acting like a recharge battery by holding some charge when you connect battery source and giving you that energy. hydrogen is lighter than air and it will not remain in that beaker for even a short time. and you cannot get any detectable voltage from such a bad design. a fuel cell efficiency depends highly upon its design
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.