What's your favorite equation from chemistry/physics/mathematics?

 

If yours isn't listed, choose other and reply with it!

1: The Universal Gas Law, pressure * volume = moles * gas constant * temperature in kelvin

 

2: energy of massive body not in motion, energy = mass * the speed of light squared

 

3: force = mass * acceleration

 

4: Euler's equation; relating the 5 most important numbers in math

 

5: Gravitation, force of gravity between 2 bodies = -constant * mass1*mass2 / radius squared

 

6: ultraviolet voodoo!

 

7: pythagorean theorem, c= hypotenuse

 

8: quadratic formula

 

9: energy of a wave

Someone doesn't know how to type a ² character

hey, who do you think added the superscript and subscript tags, as well as all the other symbols?

 

I wasn't sure if vBul. commands would be rendered on the front page; and i wasn't going change it if it wasn't, so i just played it safe

Hold down 'Alt' and type 0178

Superscript is better, because the Western character set only has 0, 1, 2, 3. alt+0178 is the losers way

Alt 0178 is quicker.

 

Quicker is better.

 

<Homer> Do you want it done right, or fast? </Homer>

 

You said yourself you didn't know if sup would work - there would have been no question that Alt 0178 would work.

 

Looooooooser

I would just like to point out that you got the quadratic formula wrong.

 

NICE ALGEBRA SKILLS

 

For the record, it is

 

-b +- sqrt(b² - 4(a)©) / 2(a)

typo.

 

 

NICE PARENETHESES SKILLS, YOU SCREWED IT UP BIG TIME, NO WAY DOING IT IN THE ORDER YOUR FORMAT GIVES WOULD GIVE THE RIGHT ANSWER.

Originally posted by Sayonara³

Alt 0178 is quicker.

 

Quicker is better.

 

<Homer> Do you want it done right, or fast? </Homer>

 

You said yourself you didn't know if sup would work - there would have been no question that Alt 0178 would work.

 

Looooooooser

 

 

 

Actually, if you're using the Cyrillic character page to view the site, it will not display properly, it displays as 'I'.

OMG.

 

 

e^x is equal to an infinite series by Taylor expansion:

 

1+x^n/n!

 

This series should look familiar, the even powers are the series for cos(x) (2n), and the odd powers are the series for sin(x) (2n+1)

 

So, e^x = cos(x) + i*sin(x)

 

cos(pi) + i*sin(pi) = -1

 

 

and -1 + 1 = 0

My favorite is the Drake Eq.

 

N = R* × fp × ne × fl × fi × fc × L

 

My 2nd is favorite is Einstiens most missunderstood eg.

 

E= M X 1.15/ .99

 

Bill

My favorite equation would definetly have to be the Drake equation which (correct me if i'm wrong) gives either a pessimistic or opptimistic (depending on the person) estimation of the number of technological civilizations in the Milky Way Galaxy...it goes a little something like this:

 

Nc = N* x Fp x Nl2 x Fl x Fi x Fs

 

i'm not quite sure on what each letter represents...( being the idiot i am didn't write it down) but i'm sure either fafalone or blike can assist in figuring that out for whomever is interested

I remember reading about the derivative or integration of -inifinity or infinity; that's pretty cool.

 

Anyone know it offhand?

god, as always, e=mc² gets the votes simply because people recognize it better

the Schrodinger Wave Equation kicks asse! Not like i have used or applied it before but we had to learn it in a module this year and i thought it looked pretty cool.

z = z² + c

This ifinitly complex mandlebot set equation

I dont really understand how it works, I use fractals for art more than maths

http://www.with-logic.co.uk/Frac.htm

My fractals showcase site

 

whats the equation for sin?

Some of my favorite equations:

 

1) Fourier transform

 

2) Definition of Gibbs free energy

[math]\Delta G = \Delta H - T \Delta S[/math]

 

3-6) Maxwell's equations

[math]\frac{n^3+3n^2+2n}{6}=x[/math]

Where x is the sum of the first n triangular numbers (explained later)

 

Just because it got me into the State Math Competition when I was in High School...

 

A "triangular number" (in this example) is definded as the sum of the first n numbers. eg "n"th triangular number is 1+2+3....+n=x. so, when n=2, x=1+2=3. When n=10, x=1+2+3+4+5+6+7+8+9+10=55.

 

The question I had to answer, what is the sum of the first 155 triangular numbers (with no calculator)... I had three minutes to get enough points to qualify...

 

well, [math]1+2+3+4+5...+n=\sum_{n=1}^{n}{n}=\frac{n(n+1)}{2}[/math]

 

so I needed to figure out (with no calculator)

 

[math]1+3+6+10...=\sum_{n=1}^{n}{\frac{n(n+1)}{2}}=\frac{n^3+3n^2+2n}{6}[/math]

 

Thus allowing me to get my answer...

 

[math]\frac{(155)^3+3(155)^2+2(155)}{6}=632710[/math]

My favourite equation?

 

Eleven + two = twelve + one.

Dont post spam

Could some mod plz delete my post and the one before it.

Well I did also answer the poll too.

 

I chose the Pythagoral equation, as I think it's pretty neat.

 

BTW - If that post offended you so much that you felt it important enough to include your own post, doing nothing more than requesting the deletion of them both- you should have just sent me a PM stating your objections.

 

Antony.

[math]e^{i\pi}+1=0[/math]

 

or

 

[math]R_{\alpha\beta}-\frac{1}{2}g_{\alpha\beta}R=8\pi T_{\alpha\beta}[/math]