AquariumBoard Forums - View Single Post - Water Changes- Why, How Much, and How Often

joephys · 04-14-2008, 12:51 PM

I posted in your other post about it, but I'll post it here

Its basically a quarter of a cylinder. The area of the base is the quarter of the area of a circle divided by four.

A=pi*r^2 Where pi is (3.14) and r is the radius, or the length of the straight side.

Then for the volume multiply by the hight. Now you have the volume in cubic inches. To convert to gallons, divide by 231. Since its a quarter of a cylinder, you need to divide by 4, then you have the volume of your aquarium

so for your numbers

A=3.14*22in*22in=1520in^2

V=1520in^2*18in/231/4=29.6 gallons

I think you had slightly different numbers posted on your other post, so the volume is close, but a little different.

04-14-2008, 12:51 PM	#4 (permalink)
joephys Registered User Join Date: May 2006 Location: auburn, wa Posts: 4,392	I posted in your other post about it, but I'll post it here Its basically a quarter of a cylinder. The area of the base is the quarter of the area of a circle divided by four. A=pir^2 Where pi is (3.14) and r is the radius, or the length of the straight side. Then for the volume multiply by the hight. Now you have the volume in cubic inches. To convert to gallons, divide by 231. Since its a quarter of a cylinder, you need to divide by 4, then you have the volume of your aquarium so for your numbers A=3.1422in22in=1520in^2 V=1520in^218in/231/4=29.6 gallons I think you had slightly different numbers posted on your other post, so the volume is close, but a little different.