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/sci/ - Science & Math

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1838221 No.1838221 [Reply] [Original]

>Perpetual motion

>> No.1838229

Hint: the water evaporates.

>> No.1838234

>>1838229

No it doesn't.

>> No.1838236

>>1838234
It does. It's the cooling effect of this evaporation which powers the whole thing.

>> No.1838241

>>1838234
>water doesn't evaporate

Lolwut?

>> No.1838250

>>1838221
yeah sure, perpetual motion.

newfags doesn't know about thermodynamics

>> No.1838255

>>1838229

not if it's glass...

>> No.1838268

>water evaporates

Put it in a place with a nearly inexhaustible supply of water.

Here's an idea. Place powerful neodymium magnets on drinking bird's body, and a coil of wires around the legs to capture the motion. Then place drinking bird in a boat so it has access to water. USE INFINITE ENERGY TO POWER THE BOAT!!

>> No.1838333

>>1838268
seriously though, is there any reason this wouldn't work?

>> No.1838334

>>1838229
>>1838234
>>1838236
>>1838241
>>1838255
>>1838268
>>1838333
Hint: it's alcohol, you fucks.

>> No.1838336

>>1838333
it would work. the energy yield would just be pitiful though.

>> No.1838385

>>1838334
Methylene chloride, not alcohol

>>1838336
Low power output but nearly infinite. Get thousands of drinking birds to increase the power output, or maybe a 50 foot drinking bird. The nations of tomorrow will be powered using only drinking birds.

>> No.1840062

People seem to be getting confused here. The fluid inside the bird is Methylene chloride. The fluid which the bird "drinks" is normally water.

It's basically a heat engine, i.e. you need a thermal gradient for it to move. Normally it's the evaporation of the water from the beak cooling the head, but you can make it move without water by shining heat (e.g. an incandescent lamp) on the lower bulb.

You could draw power from it, but it's ridiculously inefficient. Typical operation draws around 1/2W of heat power which translates to 50uW of mechanical power, from which you could extract around 1uW of electrical power (generators aren't very efficient at 1RPM and any kind of gearing would lose even more energy).

>> No.1840112

>>1838333
There would be perpetual motion, but not enough motion to generate usable power.

>> No.1840116

>>1838385
>50 foot drinking bird.
Physics does not scale up that way.

>> No.1840122
File: 168 KB, 383x367, Picture 10.png [View same] [iqdb] [saucenao] [google]
1840122

Somebody's already figured out how to harness this perpetual energy source.

http://www.youtube.com/watch?v=Rq3K6Ma0wIU&feature=related

>> No.1840128

Wikipedia: Drinking birds, also known as dippy birds and dipping birds,[1] are toy heat engines that mimic the motions of a bird drinking from a fountain or other water source. It is sometimes incorrectly considered a perpetual motion device.

Wikipedia says no. Your argument is invalid.
/thread.

>> No.1840143
File: 15 KB, 552x384, herp a derp.jpg [View same] [iqdb] [saucenao] [google]
1840143

>perpetual motion

>> No.1840145

One of these guys was the mascot for one of my undergrad phys chem courses. Pretty much every concept in the course was attached to him in some way. Great way to learn.

>> No.1840154

>>1840128
> doesn't realize that no one actually believes in perpetual motion, and that this is simply a tool for introducing a fun subject in a humorous way

>> No.1840160

>>1840143
What happens when the river shifts location, erodes the bedrock, or the Earth dries up from the expanding sun, huh?

>> No.1840163

>>1838333
water is not limitless

now, if you could power the bird via lack of kinetic energy, that'd be infinite.

>> No.1840183

>>1840160
>river shifts location
Hundreds of years
>erodes the bedrock
Thousands of years
>or the Earth dries up from the expanding sun, huh?
Billions of years

>> No.1840195

>>1840183
>troll
Seven seconds

>> No.1840237
File: 53 KB, 404x540, 23566_438888053781_698163781_5776708_6383406_n.jpg [View same] [iqdb] [saucenao] [google]
1840237

You forgot the part where it loses energy through heat and such.

>> No.1840249

>>1840195
Trolled hard
5 minutes

>> No.1840390

>>1838236
>>1838229
Well if it's hermetically sealed then the water shouldn't evaporate through the glass.

Shouldn't you guys have already known that or am I wrong and have a lot more to learn about how we pressurize things?

>> No.1840437
File: 18 KB, 204x252, mfw perpetual motion.jpg [View same] [iqdb] [saucenao] [google]
1840437

knock knock

>> No.1840453

You want a real perpetual motion machine?

Look up Atmos clock.

>> No.1840482
File: 38 KB, 700x525, 1259218223065.jpg [View same] [iqdb] [saucenao] [google]
1840482

>>1840453
>Its power source is an internal hermetically sealed capsule containing a mixture of gas and liquid ethyl chloride, which expands into an expansion chamber as the temperature rises, compressing a spiral spring; with a fall in temperature the gas condenses and the spring slackens.[1] This motion constantly winds the mainspring. A temperature variation of only one degree in the range between 15 and 30 degrees Celsius, or a pressure variation of 3 mmHg, is sufficient for two days' operation.[2]
That's pretty awesome.