>>30126
why is that?

whole thread. fuckin saved.

It is handy stuff... Just wish someone else would contribute some good stuff... tables and whatnot... whatever...

sulfuric acid density/concentration/etc table... I keep printouts of this and a nitric acid one (which I haven't found a valid link to online yet)... having others would be nice.

more

You mean like waste chemicals that you body doesn't use? Urea is a big one, but then it can be used to manage the pH of your blood (i know carbonate is the big pH balancer - OP asked for 'useless' chemicals)

Heavy metals and some trace elements from food, mercury and the like.

acetone is found in the urine

>>30169
Go find the closest living thing with a nervous system other than yourself and attempt to initiate a telepathic conversation with it.

Of course, if it were in your own body they could possibly secrete various substances that affect the rest of your being, but their signals won't influence anything else no. How could they if they're not connected?

There's a bit of wiggle room thanks to the uncertainty principle

>>30168
No it doesn't. The uncertainty principle does not effect energy in anyway.

That's where empirical data comes in. If we know the phenomenon that causes vibration and the wavelength that makes things crazy our data just gets more and more precise.

>>30171
You have no idea what I am saying do you? The bond can only absorb only one frequency, not a broad spectrum, this is the whole point of quanta. It is impossible to provide this specific frequency so it should not do anything at all.

>>30152

So the closer to a speed of light something moves, the slower time progresses for it, but to outside observance their time is still relative to their inertial frame?

And when moving at the speed of light, time doesn't exist? Everything is instantaneous?

>>30161

Yes that is right. In each reference frame clocks move as they would to the observers in that frame, whether or not they are traveling at some ridiculous fraction of c to another frame.

The only things that move at light speed are massless particles. To get a massive particle up to c it would take infinite energy. Infinity is a large number, larger than you think.

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>>30066 >>30078 >>30082
>>30116 >>30161 >>30162
No. Particles moving at 1c have no rest frame, and it would therefore be absurd to talk about time stopping.
http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/headlights.html

>>30163

We know. We've been commenting on the absurdity from the get go.

When trying to explain to laymen you have to ease them into it, not just throw out 'it has no rest frame'. The inevitable question is why?

>>30152
sorry, I'm new with the english language.
Lets say we have 3 men. one stays on in the mission control(James), one in a spacecraft designed to got the speed of light (Adam), and another man in a ship that would travel via wormhole(Mike)(. the two travelers are to go to, lets say Betelgeuse and back.
How would James Mike and Adam experience time?
Would Mike be able to keep the same time as James if he used a wormhole drive?

>>30136

Who do you think is writing all the physics papers? Sociologists?

>>30143

lol, that engineer sure got told.

>>30144

I sense another science vs engineering thread starting up and I'm dreading it.

I'm one of the few that studies both, and so they only serve to poke fun at me twice.

>>30154

I also study both, therefore I both get poked fun at two times as much, and I can dish out mean commentary two times as much ;)

Why would you bitch about Engineers? Yeah they don't do solid science but engineering is still a very hard course and essential.

Let's bitch about med students instead, fucking faggots

>>30053
Mnemonics are only good when you actually know the concepts, imo.

I help my friends with chemistry since I'm a chem major and they've just got to take the class to take it, and I find that mnemonics fuck them up because they don't truly understand.

>>30053 I don't understand the usefulness of mnemonics and memory aids. I've only ever seen them used as a substitute for knowledge and intelligence. If you understand a topic in any good detail you don't need memory aids, because you can figure out what's going on based on principals. Exceptions only exist in chemistry where the exception is to a simplified rule. If you consider what's happening with a full understanding of the topic (I believe this is what quantum chemistry is all about) then no exceptions occur. And if you know in full detail how sub atomic particles behave then an element is just that 'an' element. Who cares if its carbon or hydrogen, they all act in the exact same manner with a deep enough understanding of the topic.

The way I see it simplifications like these just allow rote learning to replace the thought process, I mean, if you taught a monkey every single possible mathematics equation (obviously impossible, but hypothetically) it could answer anything about maths, but it doesn't make it a good mathematician.

>>30083
chemistry is full of useless shit you have to remember, why does everything need 3 god damn names.

>>30033

With my limited understanding of quantum mechanics, and extending basic chemical principles (extracted from more rigorous quantum mechanical models, obviously), then whether something is a "gas", "solid", or "liquid" depends on the relative configuration of the system with respect to electrostatic interactions and its kinetic energy (often stated as the thermal energy). The manner in which each of these two distinct interactions vary depends, ultimately, to the size and shape of the molecule which accounts for how the kinetic energy is distributed among the molecules, and the surface area each of the molecules expose to each other which affect their relative electrostatic forces. Obviously the degree of which there is electron orbital distribution and its effect on the electrostic force depends on the nature of the compounds as well, so a molecule having electronegative atoms like O, N or F, usually has stronger intermolecular interaction than one only containing carbons and hydrogens assuming both have the same molecular weight. This is the distinction between dipole-dipole interactions and van der Waals interactions respectively. H-bond is indeed a special case of dipole-dipole interactions, but its ubiquity in nature, particular relating biological systems (water based), and the relatively high effect it has on a material, merits them of a name of its own.

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>>30083

This makes no sense. It would complicate every problem a hundred fold if you broke it down into it's most basic components. Yes, math is the backbone of physics, physics of chemistry, yadda yadda... It is that way for a reason, because you'd never get anything done if you analyzed every god damn thing on a quantum level.

It would be like writing programs in binary, in a sense.

also, i realized the stand might be a bit of a pain in the ass/too time comsuming. i think a netting rig would work well and be much easier.

Looks really neat, care to give details about the reaction? I haven't seen anything like that, reactionwise at least.

How high is your pH? I'm thinking you want to extract a particular amine, but anything above pH 12 should be pretty good.

>>30131
I don't think you are thinking the same thing I am thinking?

OP here, I'm not Trolling, but my terminology may be wrong.

What material does a person use to keep the police from seeing a heat source in their attic?

Infrared vision works by the principle of BLACKBODY radiation.

All objects, at room temperature, emit LIGHT in the INFRARED region of the electromagnetic spectrum. Thusly, a device can be used to collect this light, "amplify" it and then re-emit it in the VISIBLE spectrum so that we puny humans can interpret it. The hotter an object - the higher the frequency of the light and the more intense (this is how you pick out a human body temperature of 310K over the other objects at around 290K - or engines at some 350-400K)

So - OP, stopping infrared can be done in one of three ways (as far as I can be bothered to think up);

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I once saw this episode on Americas Most Wanted where this dude evaded detection from police helicopters equipped with IR by covering himself/hiding underneath pine needles. Ofcourse, they were probably trolling by saying that, but it's worth a shot especially considering the season. Just get a bunch of xmas trees and put them in your attic, see what happens.

>>30150

Well, considering what >>30148 said, if it was a winter night, then the pine needles were probably relatively cold (<273K [<32 F]) and most of the heat being radiated out was absorbed by the pine needles. Another possibility is that since pine needles are in essence a fancy packet of organic molecules, particularly aromatic and pi-conjugated alkenes (if you don't know what I'm talking about alkenes are c=c compounds and 'conjugated' means double bonds separated from each other by one single bond [-c=c-c=c-c=c- etc]), then there's a possibility pine needles strongly absorb in the IR range as well, although whether it is enough to completely conceal a man or not is beyond qualitative description.

>on the this?

oops, "on this?"

You have to support your ideas son, for instance, in what respect was newton right or wrong?

>>30146
I am still trying to figure that out. I didn't get a chance to ask him after class to elaborate, and googling it isn't proving to be very helpful because there is a novel about Newtons life entitled "Dark Matter" LOL. Come monday I will have more details about it tho, so ill bump then.

>>30149
I'm by no means an expert on cosmology - so take this with a pinch of salt.

When he says there's the conundrum between there either being dark matter, or newton being wrong. I believe he's solely (or at the very least in part) talking about the galaxy rotation problem, rather than poorly trying to explain it myself I instead point you to the wiki for it which is actually fairly concise.

http://en.wikipedia.org/wiki/Galaxy_rotation_problem

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>>30153

I would say this is a fairly concise synopsis of the main problem surrounding dark matter and its relationship to Newtonian physics. I would nevertheless take wikipedia as my next step if you are truly interested in it though, in particular relating the hypothetical models for what dark matter is.

And >>30153, despite this site supposedly being anonymous the fact that there might be 20 (?) or so of us frequently posting in this board, I think I'm starting to dig out your responses from others. The individual pattern is just starting to show up . For instance >>30078 is probably yours. Just letting you know.

aaaand I just realized I started a new thread :(

Heh...

Besides the point... FLIR has been deemed unconstitutional.. It's considered a search.

They can't look inside your house with xrays without your permission as much as they can't look inside your house with dogs. Infrared is treated the same way according to court precedent.