Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: mashger on 17/12/2012 07:52:14
-
Is this real ? or not ? The video is real , if the content is ....
-
My vote is that it is a fake.
We did discuss cooling microwaves on TNS a few times in the past.
http://www.thenakedscientists.com/forum/index.php?topic=33018.0
http://www.thenakedscientists.com/forum/index.php?topic=44782.0
And a summary here:
http://www.popsci.com/technology/article/2009-12/can-microwave-technology-be-used-make-food-cold
There are cooling lasers, but they are only effective with a small number of atoms.
Damocles came up with a solution to another youtube video about instant freezing here.
http://www.thenakedscientists.com/forum/index.php?topic=41442.msg369138#msg369138
If one uses supercooled sodium thiosulfate as suggested by Damocles, it may be transparent to the microwave (and thus absorbs very little microwave energy). Although he suggested hydrated, so it may absorb some microwave energy. Or, perhaps the microwave is broken or on its lowest setting. The microwave could provide agitation to improve the nucleation.
-
Just fiction I think. Not much science involved.
Ice doesn't absorb microwaves much so if you (secretly) have a glass of ice hidden in the oven then put in a glass of water zap it for a while, then take the glass of ice out you get a video like this.
Quite imaginative; and, to be fair, I guess using the µwave transparency of ice to achieve the effect is sort of science.
-
O.K. ...... this liquid isn't water ....
-
and what about supercooled water? Maybe the simple slight vibrations generated inside the oven can start the solidification.
-
Ice doesn't absorb microwaves much so if you (secretly) have a glass of ice hidden in the oven then put in a glass of water zap it for a while, then take the glass of ice out you get a video like this.
The film never quite shows the right rear of the microwave. There doesn't seem to be any reason that a straight-in view was not used... unless something was hidden.
The time being entered is not shown, but one can see him pressing 36 on the keypad. Shortly after starting the microwave, 35 seconds left is visible... What an odd selection of time... Unless the person empirically determined that 36 seconds, or so, was required for the turntable to arrive in the exact right position.
-
I thought that, too, Clifford, but when he puts the water in and pulls the ice out, it's from the front center of the microwave. I don't see how rotation could hide the water in the back right while simultaneously moving the ice that was initially back there to the front.
Clever video editing could.
-
The initial view of the inside of the microwave obscures slightly under half of the inside of the microwave. A cup could easily be hidden, unseen in the back, even slightly more than 180° from the cup being placed in the front of the microwave.
The final view of the microwave shows about 1/3 of the back panel of the microwave, so a second cup would have to be at slightly less than the 180° position.
Anyway, timing, view angles, and cup locations would have to be fairly precise, but swapping positions with a rotary table would be the easiest solution. I'm not sure of the table speed, if it only made 1/2 turn in 30 seconds, then one could build a cup catcher for the second cup. If it makes a couple of revolutions, then catching the second cup would be more complex.
Anyway, precise cup & camera positioning with one cup of ice and one of liquid water would be easier (but, perhaps less fun) than using an exotic supercooled liquid resembling water.
-
These TV programs detailed how similar and more spectacular illusion's are created
http://en.wikipedia.org/wiki/Breaking_the_Magicians%27_Code:_Magic%27s_Biggest_Secrets_Finally_Revealed
-
Somebody making this movie didn't prove it's still fully working microwave device. It was microwave. But it could be simply changed - microwaves turned off.
Super cold water until you shake it can be still liquid. After shaking it's immediately changing to ice.
Device is rotating cup of water and thus shaking and causing crystallization.
That's the simplest answer.