What Does a Fan Do in a Vacuum Chamber? Weird Results 

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*Science noises*

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4.8 piss wipe

@@jinxx_z5125 wtf are you trying to say? Are you roasting me

It maxed out at 20V lol

@@PorWik that’s not what matters

........ kaboom...

Great mention,, temperature would then also help dictate the volatility and level (ie, amount) of static that'd come into play

@@tv-on-da-gochannel5791 temperature? What’s the effect of temperature on van Der waals forces? Wouldn’t a higher temperature reduce the strength of static attraction by increasing the random assortment of charges and preventing alignment for long enough periods of time?

What's static?

@@AbhinandanKumar-vq9xv electricity is the movement of charge. Static means not moving, so static electricity is charges that are building up in one spot. If you’ve ever shocked yourself on a car or other metal object, that’s a static charge building up and discharging through you. You can see it in action by rubbing a balloon in your hair then letting go of the balloon (it sticks) or rubbing your feet on carpet and touching someone else or something metal.

@@AbhinandanKumar-vq9xv Static is short for static electricity, which is just electricity not caused by moving charges. In other words it's a static or not moving charge So there's no current involved. Plastic fan will develop a charge as it rotates and the balls develop charge. Opposite charges attract while the same charge repels. So the rotating fan causes a force on the balls. So it's electricity that's moving things around not air.

I was about to suggest that this could have been a factor, too.

Agreed

Wow but its just minor factor. Notice at 15V those balls at surface rotating along the direction of fan.

You need "fewer" variables... 😁 🇺🇸

Underrated

I hear it normally...

real life cow* (or just cow) , not minecraft

Overrated

rated

😂😂😂

So true

😂😂😂

And you go Super Saiyan

You must be an engineering student

That's the only meaningful result of this video

I think he noticed it too and moved his camera so you couldn't see the change in current draw. Why introduce things you don't want to distract the viewer with that takes away from your intended demonstration?

@@Fadamor For me, the voltage/amp number tells most. Put on a graph with a rpm count it would tell the effectiveness of the motor, the engine mechanical vs electrical loss, the real effort going out etc.

The current drops because the back emf increases making the actual voltage in the windings tend to 0. Without the air friction there is actually not much force the motor needs to do and so it just increases speed therotically up to the equilibrium of back emf (characteristics of the motor and speed) match the provided voltage. The inverse is that the current is maximum when the motor is stalled and doing only force with no speed and thus not having back emf. This means the motor has maximum force and current when not rotating. It is why electric cars have fantastic acceleration.

@@PauloNevesPortugal That was a really long paragraph to say, "The lack of parasitic drag in a vacuum requires less current to spin the fan at a given voltage."

and go FAT

... and it'll spin for no purpose! 😅

exactly

The beating of the blades against the particles made most of the movement, I think the static probably moved the particles more than the low pressure wind, but not more than the blades beating the particles.

The word static literally means doesn’t move lol

@@shokdj1 lol.. true.

Entirely, lmao.

Lil’ Turbomolecular Pump

@Red Nexican My exgirlfriend bought one. It is a sex toy. But she did not want it for her. She wanted to use it on me. When she came in the room looking like a human tripod, she said, "This is for you. It is to hurt you in the best way possible." She clicked the horrible looking elephant trunk wannabe, coated in a thick layer of KY, on and it made a horrible noise, like a car starter. It started to rithe and contort in an evil way. I flew up off the bed, threw on a towel, and ran out the door. I left my clothes, wallet, car, and my keys. I went to a payphone and called a taxi after a couple of miles of running. I never saw my keys, the clothes I was wearing, my wallet, my car, nor her again. No way I was going to risk that horrible Turbomolecular pump again. She could keep all the stuff Ieft. I changed my number and door locks. I had long hair and a goatee. I shaved and got a military crew cut. The woman terrified me after that. Sometimes, when I am sick and have a high fever, I have nightmares with her yelling at me as I am running away saying, "But I was going to put it in only an inch at a time! Come back!"

@@indridcold8433 lol wtf

or album name.

@@indridcold8433 don't lie, you loved it. where did you find a "pay phone"

'rub a cut' - comedic genius!

This comment deserves more likes

That laughable, if in a vacuum there is no humidity, or it is not a vacuum.

yeah the cat would prolly jump on it

@Todd Thompson My corona got healed after I did that, thanks.

Of course under vacuum some beads were simply bouncing off the walls and being thrown back by the blades, not air currents.

i think static electricity was making them move too

Agreed. The increased magnetic field would affect anything with a static charge.

Show off!!😀😂

Henning Idsøe seriously? 😑 Are you stupid or something

bj

The question is how fast ...

If they're a fan of Papa Roach, they suffocate. _Suffocation, no breathing, don't give a f*** if I cut my arm bleeding._

Man why didn't I think of that

I expected the fan to increase in speed due to lower air resistance.

Right- THATS what is absurdly silly about the movie The Martian.

So basically what your saying is rockets don't work in space! Rockets cannot propel themselves without any atmosphere to push off. Space travel is a lie

@@phylthamendment Laws of motion still apply. Rockets essentially throw fuel out that back, which means an equal and opposite force is applied, pushing the rocket forwards. You can try this with a skateboard or roller skates, throw something heavy in one direction and you will move in the opposite. No atmosphere required

@@phylthamendment the rockets push off the fuel they propel.

@@phylthamendment Well, this shows a complete ignorance of fundamental physics.

the produced heat however cannot disapate quite as well.

I've seen that too, but at 2:05 he moved the camera-angle so we dindn't see what the current was at minimum pressure.

@Darth Wheazius exactly what I was about to say

@Darth Wheazius That's what I was wondering too.

@Darth Wheazius I feel it haha. Good luck if you get to test it. Should be interesting.

When the camera moved I was thinking “no, no, go back I want to watch the amperage” lol

It can also be because as there was no air to drain the heat from motor the wires got hot and resistance increased.

@@ahmedejaz1125 That would have been an increase in amps due to higher resistance. What we saw was a reduction in amps because the fan was spinning more freely. =]

@@LocoHosa no when resistance increases current decreases because I=V/R so I is inversely proportional to R if voltage is constant.

@@ahmedejaz1125 Actually the Voltage was not constant. it changed from 3v to 17v so V=IR does not apply in this case.

The same happens in a vacuum cleaner if you block the intake hose. The motor fan starts to spin faster as it has less air resistance (vacuum).

That should be the case, yes. But only in a _complete_ vacuum, which this test was not conducted under. If you watched to the very end, he explained how the chamber was not in a _complete_ vacuum, meaning that some gas remained inside. That's why the fan had to run at a mucher higher speed in order to overcome the drag of the styrofoam beads, causing them to fly through the air. If this test was conducted in a _much greater_ vacuum, using a turbomolecular pump, the fan likely would not have been able to do anything, such as in your explanation. There are different levels of vacuum, and only a _complete_ vacuum has no gas whatsoever in it.

@Fizzle Hi , is there a medium in space ???

LOL

Here a moo there a moo every where a moo moo

You've made my day

whoa

This deserves an award for the most random thing someone has tought with a buzz sound

Inspired?

That's a good point if we only consider the rho of the gases. If we increase rho by adding in the dust being carried in the wind, it might be a bit different. I don't know of any experiments that have run with that in mind, but it's not hard to imagine dust moving along with the wind at 30mps will generate a substantial force.

Couldn't he have put in one of those planet wide dust storms that last for long periods of time? o: Just curious (: I'm sure he thought of a lot of possibilities, but I wonder if that crossed his mind too (:

@@revenge12212012 I guess not. A long lasting sandstorm would be a problem because of lack of sunlight for the solar panels. At the other hand that would mean Mark Watney would have died after a few days, probably due to hypothermia.

@@leonmuller1702 that makes sense (: hmm, what if it were like an unforeseen dust storm (not planet wide) that only lasted for about a week and made the crew leave, leading to the main character's circumstances, do you think that'd be possible? o:

@@revenge12212012 The problem is why they would leave Mark alone on mars. If dust were the problem, there wouldn´t be a need to rush and let a injured alone.

​@Lassi Kinnunen 81 If there was a landslide and one were buried they could just use his biomonitor which is sending signals to find him. A welding fraud on the one hand has tro be severe enough, that the crew couddn´t fix it, in which case the lonely astronaut couldn´t either, Or at the other hand it would be fixable like the accident with the pressure gate in the book. In either case there wouln´t be a reason to abondon mars and leave one crewmember alive and alone back there.

Never thought about it but hey, I mean how can I say no?

Fucking same mate

Yeah lol

Thanks you explain better than my teacher

"With many awful facts about the scary hippopotamus..." 🇺🇸

Very punny

RIP poor little motor ...

rip unbalanced fan blade, couldnt handle the increased rpm and eventually vibrated off the shaft.

😂 I see what you did there

This comment is very underrated

I'm the hundreth like, now 😎

Am I a cheap fan? :(

@elgur joke???

I domt get it explain pls

@@hoodrichyb5372 with a mustache and no beard he looks like the great scientist Nikola Tesla

This made me sound like a car engine reming up

ROBUX

Given that there is no air for the fan to push, there's really no load on the motor. This was my first thought as well, but I guess the only way it would overheat would be through friction.

@@FallLineJP At the end it looks like it dissipates 18V, 1,5A though it cannot be clearly seen. A whopping 24W compared to the nominal 660mW. Since also air cooling is lost, I'd say this test would end up in smoke when prolonged. But the less than a watt nominal consumption won't heat anything that big and heavy to destruction.

@@FallLineJP the friction is created by the magnetic fields that turn the fan. Turn a motor by hand. They dont spin freely. They start and stop. That's from the fixed magnets. That will cause friction even in a vacuume from my understanding. Eg induction heating.

@@FallLineJP Friction and the wires heating up because of the high current going through them.

The resistance inherant to the copper windings in the motor generate heat regardless of motor resistance. My guess is the heat build up warmed the output shaft so high that it started to transition the plastic blades towards a liquid, breaking the static friction holding the fan blade on the motor output shaft and allowing it to fly off. I’m pretty impressed that the motor seemed to survive that abuse.

I thought exactly the same thing after the split second it took to figure out why the alligator clips.

Agreed

Isn't it easier to reach now?

Agreed

@@davidlegkodukh6969 No because I was accustomed to the old one, but maybe for you

Yeah it sucks. They tried it before and the reverted back to the old format, now they've done it again.

What

What is the equation. Way over my head mate

It's a result of Bernoulli's equation(dynamic pressure is 0.5*rho*V^2). For both equation, D is drag, the drag coefficient Cd, the surface area S, the air density rho and airspeed V.

@@amovifa4525 wow, lol. Thanks for sharing. God bless

2+2=4

They are bloody expensive. That, and i'd rather not trust anything cheap when it comes to spinning at 300k RPMs. Maybe renting one for a short time for a miniseries would be a viable option.

What's that

Considering the one that he has and the lowest it can go.. It's damn good. And anyways he doesn't need to invest huge dollars on turbo-molecular pump 😅 For regular experiments his vaccum pump is great enough! 😁

He could also just build a mercury powered vacuum pump like CodysLab did. It creates a near perfect vacuum

Around 600 dollars

I would assume that even the smallest quantity of air could topple a ship on its side but it would need to be blowing VERY fast, don't know if it was going fast enough in the movie tho

Andy Weir already acknowledged that it's one of the few mistakes that were made in the story

It wasn't just air, you know? It was also sand, dust and debris which at high speeds can build up tonnes of force when hitting against a static object like a ship. That and the fact that science fiction is not the same as applied science.

@@sebastianortega1938 You would have the same problem with the sand, the air is too thin to do a very good job of blowing that around, only the tinier particles get pushed around. Velocity can overcome that, which is why the Mars helicopter's blades will spin super-fast. Anyway, the Mars rovers did get dust on them, fine like talcum powder. I don't know why they didn't build vibrators into the solar panels to shake the dust off.

Still an awesome movie!

Also if he measured rpm in air and in vacuum

Ha Ha Ha..

I wanna see one of those ionic wind levitators in the vacuum chamber.

@@mr.waffentrager4400 I agree, I wanted to see how the fans speed increases as the air is pumped out and it has less and less air to push it of its way

Inverse thinking.

ok DOOMer

I think its the vibrations of the motor too as the balls stayed on the floor and only jumped when the vibrations where high enough to make them bounce

Static charges

It was just the motor's vibrations being transferred to the floor of the chamber, then to the balls, making them jiggle more and more as the motor voltage increased. He over-drove that little 3V motor with far too much voltage, causing pretty severe vibrations on the chamber floor. The motor was stressed far beyond its 3V design limit. The tiny amount of air did virtually nothing.

Why

@@DancePartyAttack There's no air to draw away the heat generated by the motor.

hm ....there is less load on the motor due to no drag on the fan , so i was asking for the amperage drop of the motor once he starts evacuating the chamber . but .....it has still the abilty to heatsink into the motor and radiate the heat away in the ir spektrum ....i would suggest that the heat is less a problem from a electric field in the motor than from the friction of the bearings over time , because the grease would evaporate in an atmosphere lower than 20 mbar if it is not a special vacuum rated grease . and second point is that under vacuum conditions ( or was it a combination of vacuum and low gravity ? not sure about this now ) that soldering tin is tending to grow some kind of spikes ( on small circuit boards ) and can create shortcuts on its own ?

Beezer Twelve Washingbeard ...And the Most Scientific Comment Award goes to--

Ozone chemically takes 3 Oxygen Molecules and produces 2 Ozone molecules, so the generation of Ozone does not increase pressure. Good guess, but the chemistry math does not support the theory. It is more likely as possibilities, the lack of cooling increased the heat and the bearings, or windings broke down and released some of the magic smoke. When the motor was at very high speed, hitting the pellets, may have broken some of the cells of Styrofoam, liberating the trapped gas. With very little Oxygen present, I don't think that there was much Ozone at all. I would like to see a repeat of the experiment with a high vacuum gauge on the chamber to see the pressure rise when the snowglobe effect returned. I think that was due to a pressure rise. An electric arc from a plasma globe coil can provide the color of ionization to provide a spectrum of the gasses present. I suspect the gas would contain the gas used to form the foam beads.

Dont forget to go at night so its not that hot when you reach the sun🤣🤣

And your enemies would too..

It went from 0.25 to 0.15A.

In reality, there is no such thing. A Vacuum is never zero. There are always some molecules. NDT explains here. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lcYPL3s2Mmw.html