Calculating surface area
catfish
> I found a formula on the net that goes like this:
>
> Surface area = 4 pi r squared
You found the right formula for surface area of a sphere.
So, I don't know what more you want, but I can give an example like you
asked.
Say you use 1 inch radius balls, which would mean they measure 2 inches from
top to bottom. (Top-Bottom is diameter, radius = half the diameter)
So, you have some two inch diameter balls. For the calculations we are
doing here, we do not need to worry too much about the acuaracy we use for
Pi, so we can use a very simple 3.14.
Surface area of your balls =
4 * 3.14(Value of Pie)*1^2 (Radius squared) = Surface area
1^2 = 1 so SA=4*3.14 SA=12.5 sq. inches.
We could do this for a radius 1.5, 2, etc by replcing 1 squared by whatever
number you have squared. I chose one since it squares to itself.
Now, you have 12.5 sq. inches of surface area per ball. If you find you need
100 sq. inches of surface area for filtration you can take (Surface Area
Needed) divided by (Surface area per ball)
100 / 12.5 = 8 balls.
Well, I hope I didn't offened anyone by going into such detail. I tutor math
sometimes and I don't know what level of mathematics you understand, so I
tried to make it as simple as possible, I apologize if this was redundant.
If you need any help doing any actual calculations, don't be shy about
emailing me. Just see the trailer for my email.
Catfish
Donald B Haley
to set up my own trickle filter with large custom sized balls in the media.
I found a formula on the net that goes like this:
Surface area = 4 pi r squared
I think it means area equals 4 times pi times the radius squared.
I need to use it to find the number of square feet of surface area the
Bacteria would have to colonize on the Balls.( But you knew that already!
:-) )
Any Math Gurus that can help and give an illustrating example?
Thanks!
hao.an...@gmail.com
> > I found a formula on the net that goes like this:
> >
> > Surface area = 4 pi r squared
> So, I don't know what more you want, but I can give an example like you
> asked.
>
> Say you use 1 inch radius balls, which would mean they measure 2 inches from
> top to bottom. (Top-Bottom is diameter, radius = half the diameter)
>
> So, you have some two inch diameter balls. For the calculations we are
> doing here, we do not need to worry too much about the acuaracy we use for
> Pi, so we can use a very simple 3.14.
>
> Surface area of your balls =
> 4 * 3.14(Value of Pie)*1^2 (Radius squared) = Surface area
>
> 1^2 = 1 so SA=4*3.14 SA=12.5 sq. inches.
>
> We could do this for a radius 1.5, 2, etc by replcing 1 squared by whatever
> number you have squared. I chose one since it squares to itself.
>
> Now, you have 12.5 sq. inches of surface area per ball. If you find you need
> 100 sq. inches of surface area for filtration you can take (Surface Area
> Needed) divided by (Surface area per ball)
> 100 / 12.5 = 8 balls.
>
> Well, I hope I didn't offened anyone by going into such detail. I tutor math
> sometimes and I don't know what level of mathematics you understand, so I
> tried to make it as simple as possible, I apologize if this was redundant.
>
> If you need any help doing any actual calculations, don't be shy about
> emailing me. Just see the trailer for my email.
>
> Catfish
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