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 use black hobby paint & small brush to add recipient’s name to back of mug (which I requested be left blank - thank you!). This is a terrific gift for hard-to-buy-for slightly warped friends! BG
good mug but why does it sometimes say creepy things to me kinda sus ngl
up ya bum
Fast shipment Better than expected!
Customer service was very responsive and helpful
Wowzers
Every web purchase should be this easy! Love it!
Great quality, although a high price for a mug! Printed really nicely and came out really well. $30 worth the laugh.
High quality finish
I just love mugs
balls
HA HA I USED FUNNI NUMBER FUNNI NUMBER GO BRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
gave it to my mom, she was proud. (shes dead)
My maiden name was Puddy and I just loved this mug that defined what Puddy means! I bought one for my brother as well as one for me… And this is the first time in all of our 70 + years that we have heard Puddy defined! We both are super grateful!
The color of the block highlighting the subject word was labeled "Flamingo Pink", but on the mug, it's actually closer to lilac and the woman I bought this mug for loves the color pink. I do like the apparent permanence of the design on the mug, I'm just disappointed with the inaccuracy of the color.
One day when I was walking down the street a man gave me this mug and said that it will be the best thing that ever happened to me, when I got home I filled the mug with the most delicious coffee and I became a penis. this is the best mug in the world thank you kind stranger for giving me this.
quimsy is my son's name. i find this mug overwhelming. there not man things in my possession that i find as overwhelming as this mug
Ah SlaTT Th1S mUg g0T M3 oN THa7 T1M3... S1PP1N L3AN OuT D1S sH1t 🧛♂️💉 *JuS7 A J0k3 vAmP 🤟🏿
This helped me figure out what the word meant when my 35 year old father said he would beat my doonies down. For context I am 12.
Great, it was a gift and he loved it
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