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
Just as described. Excellent packaging. Timely shipping. No problems here. Thanks!
Just wish it could have had a little more of the text on the mug, but otherwise it's great. What a clever marketing idea to be able to get this on t-shirts and mugs.
I spent the money and directly sent this to be the pettest person ever to a person who was doing this to me. It was awesome
It’s a sturdy ceramic mug. A little pricey, IMO, but I really wanted this definition on a mug. ¯\_(ツ)_/¯
Just what is needed for someone’s desk during the pandemic and beyond when they have to “MacGuyver” to make things happen.
Best purchase of my life, it's all downhill from here!
The Urban Dictionary offers one-of-a-kind products in its Coffee Mugs if you want to purchase something interesting. A bit off-center and not the norm. This is the place to be. Customer service is responsive to your query when asking a question. All Good.
Bought the mug, Holds up like a charm!! I was "Botello'd" by my wife so I think its fitting
Bought the mug. Holds up like a charm. I got "Botello'd" by my wife. Makes me feel nice.
Just as described. A fun line of products. Have already ordered others. Thanks!
You should get the penis mug. It's pretty elite - Elongated Muskrat
Loved how fast this arrived! Fun blast from the past... Dana Hills Dolphins!
It shows exactly what I want!!
its an alright mug. its moderate. mid. not the best. not the worst. pretty normal. if it was the weather it would be 50 degrees F. something so unexperiencing and experiencing at the same time. if it was on a number line, it would be in the center. i rate it a 5/10.
I can't believe my name became a meme. I love this mug.
Got a Fratz at home Love this mug. Fratz means kinda perky darling in my language, and since my darling loves to fratz when I'm around (that's indeed often) this is THE perfect gift for her.
Give me the mug
give me mug
I Really enjoyed to color options and the mug is made of very good material and i will be buy much more in the near future these mugs are the absolute best
Jana loves her mug. Drinks from it everyday and counites to inspire her. Thank you so much for this gift
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