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
It was easy to correct grammar when necessary, and then to order a great gift for a member of a wedding party. Nice, simple, and sturdy mug.
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Love that I got an Urban Dictionary word definition from someone I know! So much fun and great memory item!! 😊
I like it but it took a long time getting here
Very basic mug but does the trick!
The mug is of good quality but advertisement needs to change as the sample photo for ordering gives the customer an illusion that the entire mug is of that color ordered when it is not
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Nice, but I need the “Reservation Dogs” version of “Aho!”
The mug is a gift for our Fantasy Football league winner…or loser. I'm not sure yet; it's a bit of a spoof that will be disclosed on Thanksgiving.
Love it just like your ranking to be noticed at 4 to stabilize with bots at 5 but looks real
Perfect Mug My CPacket mug arrived perfectly with the definition of that skid
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What is there to say? It's a mug, with a word in front and the definition in back. Nicely done!
This will be the perfect gift this winter! It even came in a nice little box. The mug seems to be of good quality. It was a bit pricy, got to be honest, but it’ll be very well received.
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The mug is just the right size, and the graphics are awesome!
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