# Volume of a Sphere

6 Steps
A sphere is nothing but a three dimensional circle. If you can imagine a smooth ball, suspended in mid-air, perfectly round... then you get a sphere.

All of you have seen spheres...They're everywhere!
If you've seen the solar system, you've seen spheres..If you've played ping pong, or golf or soccer...even basketball or cricket and hockey...you've seen spheres. If you are a housewife, you'll see spheres in the fruit basket... And if you are in kindergarten...they're in your abacus set!
Spheres are very common shapes, one encounters in everyday life.

This instructable will show you "how" and "why" to calculate the volume of a sphere.
I have explained every concept and every formula in great detail. Also , I have filled up this instructable with a lot of practical examples which will help you understand me

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 1-40 of 62 Next »
GASSYPOOTS says: Mar 20, 2012. 11:38 AM
easiest way= make a 2 piece mold of the sphere in clay hardden it fill both halves with water 1ml=1 cubic cm so measure how much water it takes :D
knektek says: May 15, 2009. 11:56 AM
totos in reply to knektekOct 1, 2011. 11:30 AM
it's the same
PKTraceur in reply to knektekMay 16, 2009. 7:52 PM
Cant that be 3.14 * diameter?

-PKT
Yashknowsbetter (author) in reply to PKTraceurMay 16, 2009. 9:49 PM
diameter is nothing but twice the radius...so you can write any equation in terms of diameter as well...if i'm not mistaken, you've written the equation of circumference of the circle...it's right...
PKTraceur in reply to YashknowsbetterMay 17, 2009. 6:34 AM
So, i'm right? -PKT
Yashknowsbetter (author) in reply to PKTraceurMay 17, 2009. 12:02 PM
yes...circumference=pi*diameter.
Yashknowsbetter (author) in reply to knektekMay 15, 2009. 3:37 PM
Yeah...scotty3785 is right.. When multiplication signs are the only signs in an equation, parenthesis rarely matter. Although the issue with matrices is different...
scotty3785 in reply to knektekMay 15, 2009. 2:49 PM
Try that on a calculator.. pi x 10 x 10 is the same as pi x (10x10)
GASSYPOOTS in reply to scotty3785Mar 20, 2012. 11:38 AM
its one of the properties of multiplication
tsaffert says: Aug 18, 2011. 12:11 AM
water displacement FTW
SubFusion says: Apr 11, 2010. 2:56 AM
V =  d x d x d / 1.91
mathman47 says: May 29, 2009. 1:09 AM
You did a nice job of explaining a hard concept. Now explain integration.
Yashknowsbetter (author) in reply to mathman47May 29, 2009. 7:41 AM
integration would be harder to actually explain..but i'll definately try!
66411 in reply to YashknowsbetterJun 22, 2009. 12:05 AM
You could try to explain how to find the area of two intersecting spheres then you would need integration and several years differential calculus.
Xellers in reply to 66411Sep 2, 2009. 8:39 AM
You could just use the disc method to integrate the portions of the intersecting spheres and then add the results. Its not very difficult.
Yashknowsbetter (author) in reply to 66411Jun 22, 2009. 4:16 AM
I know.....im really perplexed as to how i can explain the concept of Integration itself ...any suggestions.???
mathman47 in reply to YashknowsbetterJun 22, 2009. 8:47 AM
Let's see. Take 3 years and 4 to 5 1,000 page textbooks. Seriously, I think graphing is the way to go. Find the area under a curve using smaller, and smaller (eventually an infinite number of) rectangles. I can't get to my books right now, but I think that's how I was taught. Good luck.. We're all rooting for you.
Yashknowsbetter (author) in reply to mathman47Jun 22, 2009. 9:37 AM
yaa..thats right i guess that's the simplest way to get it done...i'll try my best...
Xellers in reply to YashknowsbetterSep 2, 2009. 8:37 AM
Why don't you just prove that an integral is an antiderivative? I think its the most straightforward way.
kourpas says: Jul 8, 2009. 2:26 PM
(removed by author or community request)
I don't mow my garden, I harvest my garden. I mow the grass around my garden.
vic587 says: Jun 1, 2009. 10:33 AM
ease up with the exclamation marks :)
Yashknowsbetter (author) in reply to vic587Jun 1, 2009. 11:43 AM
Yeah i know i've put too many in there, but dont worry they wouldnt hurt ne1
vic587 in reply to YashknowsbetterJun 2, 2009. 6:16 PM
ya I know :). Hey just wanna say thanks a lot. Your instructable helped me out a lot for a project I had to do for school. thanks! I appreciate it.
Yashknowsbetter (author) in reply to vic587Jun 9, 2009. 2:17 PM
lock says: Jun 2, 2009. 9:03 PM
Cant you just get the volume by multiplying pi by radius by radius by height of a cylinder of the same dimensions (lets say 2 height and 2 radius) then cut it in half (or third I can't remember) then multiply it by two? I am pretty sure that gets the volume of a cylinder.
GlueyMcGee says: Jun 1, 2009. 1:23 PM
Volume of a sphere, the simple way: 4πr² OR four times pi times radius times radius...just find the radius! easy isn't it?
azice says: May 23, 2009. 2:33 PM
Couldn't you just put it into a graduated flask with water in it and subtract the difference? I think I'm missing the point, sorry.
Yashknowsbetter (author) in reply to aziceMay 23, 2009. 11:15 PM
Yeah...thats right!
Foaly7 says: May 15, 2009. 5:53 AM
A hockey puck is a flat circle, not a sphere.
SamuelAaronWard in reply to Foaly7May 15, 2009. 3:29 PM
A hockey puck is technically a right-circular cylinder, not a circle or a sphere.
lake75 in reply to SamuelAaronWardMay 18, 2009. 12:16 PM
It is a sphere if you spin it! GO CONDORS! LOL
SamuelAaronWard in reply to lake75May 18, 2009. 1:15 PM
I'm not trying to be jerk here,... but it's not even a sphere if you spin it. Yeah, it looks a lot like a sphere, but it's still not. Only a circle rotated about a radial axis will result in a sphere. A right-circular cylinder (a circle extruded through some depth along a line perpendicular to the plane of the circle) rotated about a radial axis will result in something different than a sphere.
Yashknowsbetter (author) in reply to Foaly7May 15, 2009. 8:05 AM
There are two kinds of hockey played around the world, ICE hockey is played with a puck, which is as you said , a flat disk. But the other kind, played on a turf field uses a round white colored ball ( which is very much, a sphere)!!!
Dragons says: May 17, 2009. 5:46 PM