Recent content by Borek

Note: silver you dissolve is already not pure (hallmark - if present - can suggest purity, but typical jewellery is made of silver alloys with up to 10% of other metals), so it is an additional source of things that can interfere.

It sometimes depends on what the equation is. There is at least one equation very often used in chemistry (so not physics, but I am sure physicists will have similar examples) that is nothing else but a rearranged basic equation describing acid dissociation - it is just that the rearranged...

Louis Pasteur (of the vaccination fame) separated racemic mixture of tartaric acid by drying it out and patiently sorting crystals under microscope. That's where it started. Before it was known that tartaric acid is optically active if extracted from the plant material, but is not when...

No way to produce more, mass conservation doesn't allow for that (in a way stoichiometry is an elaborate way of saying "matter is not lost nor created"). So it is always a problem with measuring or impurities (if it was a water based reaction most common problem is drying the product before...

No idea why you think it should be otherwise, you start with somethin that is +3 charged and combine it with 4 -1 charges, no way it can produce anything but anion. Lack of ionic bonding doesn't matter - SO42- is also an anion despite not having ionic bonding. Or is your question why it...

Thing is, space is quite an exotic place - very low pressure, very low temperature, molecules are so separated they very rarely have occasion to interact with each other. That promotes highly unusual reaction paths which are quite interesting, it is just that reactors with volume measured in...

So helium-4 atom doesn't occupy space?

Interesting. I have read about similar technology were in the rubber there were tiny sealed ampoules with glue, they were intended to tear open when the rubber is breaking (for any reason) and to seal out the hole. Sounds like a safer and more convenient approach (both for wrens and users).

Possible, but still a bit strange - it wasn't exposed to temperatures other than it would be on the car, and somehow I don't think goo inside the tyre is something desired.

No, you can have a third, inert gas inside. Oxygen in, carbon dioxide out, inert gas stays inside and its amount is constant, keeping the pressure identical to the outside. I don't see how to get a mask working in conditions given without some additional pump. RO doesn't work against a pressure...

Just a comment: if you see a liquid (whatever, be it water, molten metal, anything), there is a vapor over it. The question is not whether it "can" evaporate (answer is yes, always, actually there is even some vapor over solids), question is "how fast" (and here I doubt you will get a better...

Google for "emergent properties". And this basically boils down to eons old discussion between reductionists and their opponents. Don't expect clear answers, more like more and more questions.

What it tries to say is that the relationship holds precisely only for ideal gas (pointlike molecules with zero volume, no interactions other than elastic collisions), and that the lower the pressure, the closer the real gas is to the ideal gas. This is quite common in the real systems, you...

It is enough that one of them failed and shorted in any way (and for whatever internal reason) to burn two others as they are under 400 V now. That's actually the most likely explanation of what happened.

Perhaps I am missing something, but what kind of li-ion batteries produces over 800V? As far as I am aware it is 4.2 V per fully charged cell, to get to 800+ volts you need almost 200 cells - but connected in series.