J-20... The New Generation Fighter II

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vesicles

vesicles

Colonel
Re: Microwaves, Avogadro's number, and RAM

vesicles said:
I can't seem to find a video of it, which is weird. But this is the only thing I can find

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Well, I lied in my last post. The temperature of the food did not stay constant, as I recalled. After checking the website, I found that the temperature actually dropped when it was placed on a spinning radar antenna...
 
D

delft

Brigadier
Re: Microwaves, Avogadro's number, and RAM

The classic admonition is : Don't stand in front of a radar antenna, because your balls might get fried.
 
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latenlazy

Brigadier
Re: Microwaves, Avogadro's number, and RAM

Anton Gregori said:
Ugh. Sorry for continuing this... I promise I'll stop after this. But it would be wrong to let people think that radar can be (realistically) used for frying stuff...



It's not that they can't absorb microwave energy. It's that 1/ the water molecules (as well as all the other molecules) in a gas are far apart, unlike a liquid. That's why you don't get hit with a blast of super-hot air when you open your microwave. 2/ the energy output of your microwave is concentrated in a very small space - say .25 cubic metres max. The radar is scanning hundreds of cubic km.

I don't know how to begin to do the math - I guess figure out how much water per cubic metre and multiply that by the specific heat of water - but I suspect that even a large land-based nuclear power generator couldn't vaporize that much water in a reasonable amount of time.

Googling around for anecdotal evidence about this, I came a across some forums where people asked whether or not you could use a radar antenna to heat food. Apparently you can heat things a little if you stick the food right in front of the antenna and are willing to wait for a very long time.
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Brother Wiki said:
A microwave oven passes (non-ionizing) microwave radiation (at a frequency near 2.45 GHz) through food, causing dielectric heating by absorption of energy in the water, fats, and sugar contained in the food. Microwave ovens became common kitchen appliances in Western countries in the late 1970s, following development of inexpensive cavity magnetrons. Water in the liquid state possesses many molecular interactions which broaden the absorption peak. In the vapor phase, isolated water molecules absorb at around 22 GHz, almost ten times the frequency of the microwave oven.
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This answers the question. Keep in mind X Band is only 12 GHz. Of course, the absorption spectrum could change when water vapour is concentrated into clouds.
 
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J

johnqh

Junior Member
Maggern said:
Interesting. In that pick you actually clearly see that there are internal weapon bays on the sides as well (as has been suggested by many earlier)
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Yeah, I have to admit that I was wrong (about the side weapon bays).

So the canards must be limited in their angles during flight....which doesn't seem a big deal from this photo - around 20 degrees or so.

Also, the cockpit is clearly tinted.
 
T

ToxSic

New Member
Re: Microwaves, Avogadro's number, and RAM

bd popeye said:
True..Years ago the USN did a study of Avionics techs and found many of them were sterile...

More J-20 fan art.. This pic is 1,920px × 1,080px..Click the thumbnail then click again at the photo host! Enjoy!!

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props to the artist!
what is that.. oil paint...? color pencils? tablet?

too bad for the 'fan-boy/girl' text... :/
 
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