radiometer
A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or an ultraviolet detector.1 Microwave radiometers operate in the microwave wavelengths. While the term radiometer can refer to any device that measures electromagnetic radiation (e.g. light), the term is often used to refer specifically to a Crookes radiometer ("light-mill"), a device invented in 1873 in which a rotor (having vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light. A common belief (one originally held even by Crookes) is that the momentum of the absorbed light on the black faces makes the radiometer operate. If this were true, however, the radiometer would spin away from the non-black faces, since the photons bouncing off those faces impart more momentum than the photons absorbed on the black faces. Photons do exert radiation pressure on the faces, but those forces are dwarfed by other effects. The currently accepted explanation depends on having just the right degree of vacuum, and relates to the transfer of heat rather than the direct effect of photons. 23 A Nichols radiometer demonstrates photon pressure. It is much more sensitive than the Crookes radiometer and it operates in a complete vacuum, whereas operation of the Crookes radiometer requires an imperfect vacuum.
The Urban Dictionary Mug
I love it. High quality. Just as I had hoped.
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This mug is wonderful it’s so funny and I gave it to the kid that made the Definition and he started dying laughing
War. War Never Changes. War, war never changes. In the year 1945, my great-great grandfather, serving in the army, wondered when he get to go home to his wife and the son he never see. He got his wish, when the U.S. ended WWII by dropping an atomic cloud on Hiroshima and Nagasaki. The world awaited Armageddon, instead, something miraculous happened. We began to use atomic energy as a nearly limitless source of power. People enjoyed luxury once thought in the realm of science fiction. Domestic robots, fusion powered cars, portable computers. Then, in the 21st century, people awoke from the American dream. Years of consumption led to the shortages of every major resource. The entire world unraveled. Peace became a distant memory. It is now the year 2077, and we stand on the brink of total war, and I am afraid, for myself, for my wife, for my infant son, because if my time in the army taught me one thing; is that war, war never changes.
Excellent satire - didn't see comments to that end, so find it hard to fathom if most readers, in turn, didn't laugh out loud, and say so. But apparently not.
I am gonna buy it and give it to my nine year old brother
Super Funny Mug 😂
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The mug is awesome, the yellow color is great but green is also good, the scream mug is the best mug in my entyre live!!! I can't imagine my life without this mug, i cant stop buing it.... I have like 30 mugs every color in this site and also i'm ordered a new one, please help me.
It is amazing I was having a bad day and I read this. My name is Evan and this made me happy
This mug made me horny.
looks perfect!!! we loved it
I ordered 4 of your mugs -- and have received 3; hopefully, the 4th is on its way! So far, I've received "fame," "620," and "$" ... only needing "hulo." ...It might be a matter of me being patient, that the 4th mug is on its way. However, the 3 received SO far are all EXCEPTIONAL, in every way!!! Mark Moilanen
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