11–20 of 34 posts
They're shockingly ugly (and expensive) beasts, but you can now get atomic wristwatches. (Actual atomic watches, not the "atomic" kind that simply receives the radio time signal.) https://www.hoptroff.com/collections/atomic-timepieces
Well the pocket watch isn't that bad looking......
The description of their "high-pressure liquid chromatography" technique sounds an awful lot like how one would enrich uranium (you know, as one does.) Did they accidentally invent a better uranium enrichment process (or independently reinvent a classified one?) Or is there some difference between {C60, N@C60} and {U235, U238} that makes using HPLC to enrich it impossible?
Given atomic mass of C is 12.011, of N is 14.007, the molar mass [1] of the fullerene should be:
M(N@C60) = 14.007 + 60×12.011 [g/mol] = ~734.667 [g/mol]
Then, given:
N_A = 6.022140857e23 [1/mol] — https://en.wikipedia.org/wiki/Avogadro_constant (number of molecules in 1 mol)
p_g = 200e6 [£/g] — price per gram given in article
n = ? [1/£] — number of molecules one would get for £1
I devised:
n = N_A / (p_g × M(N@C60)) = [1/mol] / ([£/g] × [g/mol]) = [1/mol] / [£/mol] = [1/£] = 6.022140857e23 / (200e6 × 734.667) [1/£] = ~ 4e12 [1/£] ?
In other words, it seems you could buy ~4'000'000'000'000 molecules for £1 ?
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Earlier quoted context omitted.
That’s impressively small. I had a rubidium frequency standard which was several orders of magnitude larger I.e medium sized hardback book. This used a cesium beam approach. Haven’t seen one of them less than a 2U rack before. Dubious as to the point though as the sources all have a finite operational life, usually a decade or so.
Nowadays wrist watches rarely have a point besides showing off your wealth.
(this obviously does not contradict your point - I mention it because I like talking)
They're shockingly ugly (and expensive) beasts, but you can now get atomic wristwatches. (Actual atomic watches, not the "atomic" kind that simply receives the radio time signal.) https://www.hoptroff.com/collections/atomic-timepieces
Oh well, at the end of the day your clock is still going to vary based on your altitude (distance from Earth’s gravitational field), unless you also correct for that. ;)
Earlier quoted context omitted.
> Requires an iPhone or Android phone. Oh my.
For the initial time sync, apparently. I guess if you have an atomic clock on your wrist, you want the time displayed to actually be correct.
Earlier quoted context omitted.
That’s impressively small. I had a rubidium frequency standard which was several orders of magnitude larger I.e medium sized hardback book. This used a cesium beam approach. Haven’t seen one of them less than a 2U rack before. Dubious as to the point though as the sources all have a finite operational life, usually a decade or so.
Nowadays wrist watches rarely have a point besides showing off your wealth.
We have clocks in most places. You could put a clock into your bag. But no, this is so important that we would place this on our wrists for instant access.
They're shockingly ugly (and expensive) beasts, but you can now get atomic wristwatches. (Actual atomic watches, not the "atomic" kind that simply receives the radio time signal.) https://www.hoptroff.com/collections/atomic-timepieces