What practical use is chemistry besides making meth?
I'm taking it as a dual major just to make my resume look better.
make coffee
Just about everything you touch was at least consulted by a chemist. They have their filthy hands on everything physical.
>>8277158
Google BASF, now look around around your room.
I can guarantee you that at least 20 things in your room contain chemicals that come from that factory in Ludwigshafen.
Chemistry is massive money because chemicals are in literally everything.
Lets say I put a tank over a fire, the tank is filled with air.
The fire is 1000 degrees.
Will the temperature in the tank ever exceed 1000 degrees?
>>8277107
Depends on how well the tank radiates heat. If its a perfect insulator then there is no limit on how hot it can get inside
>>8277129
For this experiment the tank is a perfect insulator.
So even though the heat of the flame will stay at 1000 degrees the heat in the tank can rise above that?
>>8277169
Yes of course. The heat will never stop rising
whats the formula for relating exponents?
if u=y^-3 and y=u^3, then what is u when y^-4?
if u = y^-3 and y=u^3 then u*y^4=u^3
so u^2 = y^4.
so u^-2 = y^-4
[math]y^{-4} = (y^{-3 }) ^ { \frac{4}{3} }= u^\frac{4}{3} [/math]
>>8277079
This doesn't make any sense, because quite obviously [math] u^2 = y^{-6} \neq y^4 [/math]
Has /sci/ ever built a DIY spectrometer before?
I'm looking to do so using some of the basic build principles from the Open Lab Spectrometer project, but rather than using their webcam-based design, I'm looking to use a linear CCD array with an Arduino as a microcontroller so I can get some actual shit done with it. Arduino aside, I am aiming for a total build cost less than $100.
I am mostly wondering if it's possible to get high-quality optical mirrors without going over-budget. I'm looking for a concave one for light focusing, and another for light collimation. Anyone know of any suppliers (shipping from China is fine) that could supply that kind of thing on the cheap? I don't want to start designing the build until I have all my parts so I can get the build geometry worked out.
CCD arrays and diffraction grating are incredibly inexpensive, so if any optics dudes could point me in the right direction, I should be set.
>>8277049
Should I use something else? I'm all ears on suggestions on the electronics; this will be my first project of this sort.
>>8277043
>>high quality optics
>> cheap
Pick one
What part of the spectrum?
You can buy a handheld spectrometer for $250:
https://www.consumerphysics.com/
I think it is pretty shit though
Here's another one:
http://paxinstruments.com/opensource-spectrometer/
But it almost exclusively works in the visible range
Alright /sci/, thought experiment time!
Imagine you have two space stations built about 400,000 miles apart in the emptiest region of their galaxy. Between them, despite the nearly impossible odds, they have managed to build a thin rod composed of some unfathomable material that is unbreakable and completely rigid. The rod is connected on either end to a lever and a contact point that will light up a small light bulb in the other station's module.
One day Space Station A shoots a laser towards the other station and in that same instant pulls the lever to activate the lightbulb on Space Station B.
Does the laser reach Space Station B at the same time their light bulb turns on, or does the light bulb turn on first?
If the lever is infinitely rigid, it would turn on the lightbulb faster than the speed of light. Which is why objects can't actually be infinitely rigid and unbreakable.
>>8276901
The atoms in the rod can only interact as fast as the speed of sound. So the force you applied pulling the lever has to travel across the entire rod at 340m/s (or whatever the speed of sound is) before the switch at the other end feels the force.
>>8276933
>The atoms in the rod can only interact as fast as the speed of sound
what
Just finished A-level maths and I'm looking to strengthen my maths. Any books or website recommendations for a mathematician with an A-level ability?
>>8276712
http://4chan-science.wikia.com/wiki/Mathematics
http://4chan-science.wikia.com/wiki/Math_Textbook_Recommendations#High_School
>A-levels
>hard
lol Americans...
>>8276712
>A-level maths
The fuck does that even mean?
Are any /sci/entists paranoid about being killed by a time traveler?
why would anyone time travel into the past? this world sucks, a glorious bright future awaits
>>8276672
I don't believe in car I only believe in trains. You can't drive without a rail!
So I see a lot of different information about these people. Some places don't seem very reliable and there's tons of conflicting information.
Things like whether they
>had primitive boats
>used manganese dioxide to make fire
>had the ability to make complex sounds for communication
Does anyone know anything or have reliable sources for this kind of thing?
Sorry if this is more appropriate for /his/.
They didn't have blond hair like that.
I fucking hate retarded artists doing reconstructions they have no idea about.
She looks like shakira
>>8276702
Source? Why couldn't they be blonde?
ITT /sci/ solves a Millennium Prize Problem.
How about... oh, I dunno... the Riemann Hypothesis?
https://en.wikipedia.org/wiki/Riemann_hypothesis
>the Riemann hypothesis is a conjecture that the Riemann zeta function has its zeros only at the negative even integers and the complex numbers with real part 1/2.
So all we have to do is find the zeroes of this function. How hard could that be? Finding a counterexample would be even easier, actually, and we'd fuck up a huge part of mathematics in the process!
If some random Russian dude could figure out the Poincare conjecture, then all of our brains put together here would make the Riemann hypothesis look like child's play. Let's make history, /sci/!
>>8276641
Everything can be solved by IUT, we should use it.
>>8276641
Just write something stupid on 4chan. All the zeroes will come to you and expose themselves willingly!
>>8276641
I really doubt youll ever fin a zero elsewhere
>true believer
Lets focus on figuring out a proof
Are we living in a simulation or are we in reality, or both?
https://www.youtube.com/watch?v=J0KHiiTtt4w
If so, is free will inherently given to us by the "Creators"?
Are other dimensions are just other simulations simulated to simulate yourself?
But why are they doing that?
If we live in a simulation, we are still living in reality. The only difference, this is not the highest plane of reality
>>8276560
So if you imagine something, it's in reality and that makes it real? So what's the difference? It's not about the highest plane, it's about perception.
>>8276539
If we are a simulation then who is to say the real entity that created the simulation isn't in a simulation to create simulations and add on infinitely.
Its stupid to think we are in a simulation to be honest because it creates infinite questions we cannot actually know.
>Biology is easy bro! I saw it on TBBT!
>My equation 2x+3 require more work!
Why math virgins nerds say that? Are they simply jealous?
>>8276443
Its just people being people. Tribalism is a powerful thing. Also strictly speaking your pic is biochemistry more than biology
>metabolic pathways
that's biochemistry, so it's biology but interesting.
>>8276443
>TBBT
I looked at this shit and I was immediately confused. It looks familiar but it is completely foreign to me. I was already selecting it to google search it when it hit me
>The Big Bang Theory
Just the fact that you have this show in your mind means you are an absolute faggot.
Just the fact that you made me remember that show means that I hate you and if I see you irl I will probably stab you with my dick.
Anyways, have fun being the literal lowest paid STEM degrees.
Hey! It is not usual that we math guys get to win the money debate on /sci/ so thank you for that. We need less engineers and more biofags here so that we can get our sweet sweet ego boost.
What is the best way to "relax"(i can`t think of a better word) your mind after studying? For example, after solving problems for 2 hours my head starts to hurt and i cant carry on. What would be the best thing to do while taking the break? Going for a walk? Meditating?
Also, what would be the best way to organize your studying in terms of working/resting intervals to achieve the maximum effectiveness? Please post your studying habbits so we can get a broader picture.
>>8276151
Here are mine. Usually after coming from a uni i open kanbanflow and set tasks according to classes that i have the next day. Then i rest/fuck around for few hours after what i make cofee, close all the tabs in browser except for spotify(i listen to ambient/dark ambient while studying), start the pomodoro timer in kanbanflow and begin studying. The 25/5 system seems pretty hard for me, cause after the first 1-2 pomodoros the 25 of working seem like hour and 5 minutes of resting seem like on second. I get tired really fast and have an incredibly strong urges to go browse 4chan/do whatever.
Any help on how to make the urges less strong and how to make head hurt less would be appreciated.
I guess a combination of stimulants and anxiolytics could be useful.
>>8276151
>For example, after solving problems for 2 hours my head starts to hurt
That's because you haven't pushed your limits.
>Meditating
It requires concentration, it's not something easy on your mind, if you are looking for relaxation.
>Also, what would be the best way to organize your studying in terms of working/resting intervals to achieve the maximum effectiveness?
"“His habit was to do 36 hours or more at a stretch, collapse for 10 hours, then go out, get a pizza, and go back at it,” he recalled. “And if that meant he was starting again at 3 in the morning, so be it.” When working hard, Bill Gates would rock back and forth."
There is a reason all big time CEOs brag about only sleeping 4 hours a day.
What does it say about society when people are literally filling a stadium to hear scientists talk? Isn't that a good thing?
https://www.youtube.com/watch?v=_J4QPz52Sfo
>>8276147
Either the scientist is a genius, or everybody is stupid.
>>8276147
>subtle /pol/ post
>>8276153
Well, not like there's any real scientific threads
Through electrolysis, water can be decomposed into H2 and O2. Starting with H2 and O2, one can compose water by mixing the two gases in an enclosed space and expose them to a flame or spark. This will produce an explosion AND water. I want to know how to do the same with as many combinations of elements as possible.
Does anyone know any books/notes about this topic?
>>8276030
Is this a weekly thread now?
I am not aware of any resource that focuses on the production of compounds directly from the elements.
Here's a very important example in that vein.
https://en.wikipedia.org/wiki/Haber_process
>>8276030
Carbon-carbon bonds are tough to form.
>>8277344
But you only need heat and pressure right ?
I always wondered if its possible to make meat by combining whatever molecules meat has. Can we synthesize a chicken breast or a newyork steak ?
>Calc 2 summer course exam is in 1 week from today
>haven't been to the class pretty much all summer
>need to pass this class desperately
How can I get an A on this exam. Help me
>>8275990
Khan Academy.
4Khan
my calc 2 final is also a week from today. are we in the same class?