Math Is Fun Forum

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Unit Conversion Tool

I updated the Unit Conversion Tool using Flash.

Any good?  (... any bad?)

---

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

simron

Real Member

Registered: 2006-10-07

Posts: 237

Re: Unit Conversion Tool

It's great! I especially like the slider part for quick calculations.

---

Linux FTW

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Unit Conversion Tool

Thanks, simron.

I have done my best to research the conversions, but there is always the risk of a mistake.

So if anyone would like to take the time to confirm any of the calculations, that would be good.

---

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Unit Conversion Tool

Testing out a new version.

Current version: Unit Conversion Tool

New Version: Unit Conversion Test

What do you like/dislike about each version ?

---

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Unit Conversion Tool

Hi MIF;

Nice idea for the slider on the new one.

Sometimes when I was using the Mass conversions the numbers in purple, next to the slider are missing their units.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,427

Re: Unit Conversion Tool

Hi MathsIsFun,

I think the newer version is elaborate and neatly presented.

Every possible detail has been incorporated.

I didn't find any error on the page.

The first version is good too; I think the information detailed in the higher version is much better.

Thanks!

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,627

Re: Unit Conversion Tool

Hi MathsIsFun,

I'm amazed!  I'm staggered!  It's not just good;  it's brilliant!

I'm checking the factors now.  (Well not quite now as I'm still typing this; but soon!)

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Bob

Administrator

Registered: 2010-06-20

Posts: 10,627

Re: Unit Conversion Tool

hi again,

I've played with the conversions for half an hour.  The only thing I threw up was when I tried to mess around with LY, parsecs and AU along with fathoms and feet.  At this point I had 1 fathom = 6.00000002 feet.  So just a rounding error caused I suppose by the big numbers I had previously been using.  When I cleared and restarted the fathoms came out as expected, so I don't think this is a problem.  Anyone who uses a conversion factor and expects it'll be accurate at the 9th sig fig deserves what they get.

There are so many options, so I haven't done more than scratch the surface but here's what I checked:

accceleration
area
electricity (Provoked an interesting discussion with Mrs B about whether a coulomb should be on the same screen as a faraday.  So how much is one faraday she asked.  When I said 96521.9 coulombs she remembered.  Eh?  She didn't remember they measured the same thing but remembers the conversion value to 6sf.  Interesting!)
but have a look at
http://www.britannica.com/EBchecked/top … 98/faraday
energy
length
mass
power
temperature
time ( oh wow ... sidereal day!!)
velocity

All seem ok to me. 

And then I went to check degrees to radians . 

...........................................

Oh I'm so sorry. 

Bob

Last edited by Bob (2011-12-01 02:19:16)

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Unit Conversion Tool

LOL ... will add angles.

Thanks everyone!

---

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

MilanJožefŠegon

Banned

Registered: 2022-05-31

Posts: 1

Re: Unit Conversion Tool

There lies the mistake.
As krassi_holmz rightly pointed out in the previous post,
If

[cached] 0.019073486328125 ms
then
[cached] 0.0061988830566406 ms
or
[cached] 0.0059604644775391 ms
It would not be right to say a=b.
When square root is being taken on both sides of an equation, the plus or minus/minus or plus sign has an important role to play, it cannot be overlooked.
When you had taken the square roots of the LHS and the RHS in steps 2, 3, you have taken only the positive values. Remember square root on 1 is not +1 alone, it is ±1.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.