Recent content by Borek

In theory recrystallization is one of purification methods, In practice you will never really know without precise analysis. Plus, NaCl is one of these salts that are difficult to recrystallize, as its solubility doesn't change much with the temperature.

Unless my English fails me big there is no such thing as "humidity of a solution", I suppose you mean "humidity of the air saturated with a vapor in equilibrium with the saturated salt solution"? Such highly concentrated solutions are about as far from being ideal as possible, so their behavior...

OP, here: (link removed) This is seriously misleading as written. Mass spectroscopy is a technique that involves evaporating sample in a vacuum, ionizing it, accelerating ions in an electric field, deflecting them in a magnetic field and finally detecting them afterwards so that they can be...

Perhaps I am missing something but I don't get why you mix Raman spectroscopy with mass spectroscopy, these are completely different, unrelated things.

Raspberry Pi 500 is basically Raspberry Pi 5 with some added peripherals. So a small footprint multicore 64-bit computer with built in USB, HDMI and WiFi ports, typically with linux distro on micro SD card used for storage, reasonably beefy for many DIY projects (I would even say unnecessarily...

I planned to post earlier, but real life made it impossible. Last Tuesday, 9/9, I finally released the game I was working on for the last three years, The Case of Andrew D. It is an investigative video game blending Open Source Intelligence (OSINT), digital forensics, and alternate reality...

First thing I would do would be to check it with a wire detector (few bucks for a basic model).

That's true for every atom.

Assuming someone decided "we don't need any confirmation of GR, why should we research such a natural, completely useless phenomena" back at the beginning of the XX century, we would have no reliable GPS system, which millions of drivers use to navigate and earn more by not getting lost. So you...

Just look at the map - most landmass (which is much easier to research and we know about it lot more, than about sea floor) happens to be now in the northern hemisphere. In a way it is purely accidental, it wasn't this way in the past - but at the time there was no civilization capable of research.

I just tried in the incognito mode in Chrome: manually typed physicsforums dot com as the address, then got to Random photos in two clicks without any problems.

Looks like the link to PF is being substituted by an entirely different link. Can be a problem with LINE, can be an infected device, I don't see how the problem could be on PF side (doesn't mean it is completely impossible, but that's hardly a first thing to suspect).

Not sure why you call it "a PF link". From what screenshots show this is a link to myiq dot com, which is recognized as "not safe" by the browser (and quick googling suggests it is often recognized as a scam site related to IQ tests).

Note: there is always series of hydrates, differing with the number of water molecules, and getting to each next step requires higher temperatures. Sometimes they are more stable and the thermogravimetric curve (basically you heat the sample very slowly and you register mass of the sample...

Translucent crystal vs opaque powdery is a typical difference between hydrated and anhydrous (doesn't mean it always works this way, and I would never assume something is really anhydrous just because it is white and powdery, but that's a good first guess when you see such an effect). There is...