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#1
09-18-2006, 12:24 AM
 Unregistered Guest Posts: n/a
square inch to cubic foot

how do i square inch to cubic foot ?

Thanks
#2
09-18-2006, 12:46 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,449 Rep Power: 13
Re: square inch to cubic foot

Can you provide more information as to what you are trying to do?

If this was a rectangular box,
square inches * height in inches = cubic inches
cubic inches / 1728 = cubic foot
#3
09-18-2006, 01:06 AM
 Unregistered Guest Posts: n/a
Re: square inch to cubic foot

Its Volume Of Boxes I Have H X W X D = Sq Inches And I Need To Convert This To Cubic Foot Or Have I Got The First Bit All Wrong Too ?
#4
09-18-2006, 01:08 AM
 Unregistered Guest Posts: n/a
Re: square inch to cubic foot

Say A Box Size Of 16"x7"x23" = 2576 Sq In If I Devide This By 1728 Is That Cubic Foot ?
#5
09-18-2006, 04:33 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,449 Rep Power: 13
Re: square inch to cubic foot

volume = length * width * height

16 inches * 7 inches * 23 inches = 2576 cubic inches

You were on the right track, you just called it square inches when it was cubic inches.

2576 cubic inches / 1728 = 1.49 cubic feet

I would call it 1.5 cubic feet.
#6
09-18-2006, 04:36 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,449 Rep Power: 13
Re: square inch to cubic foot

If you wanted to do it yourself online....

First here is a calculator for the volume of a rectangular box:
http://www.onlineconversion.com/object_volume_box.htm

That would give you the cubic inches, then use the Volume conversion page to convert cubic inches to cubic feet:
http://www.onlineconversion.com/volume.htm
#7
08-17-2009, 06:18 PM
 Unregistered Guest Posts: n/a
Determining Pressure Based off Density

I am trying to calculate how much psi of air i would need in order to make a aluminum pipe float in a pool. I determined how much flotation is needed using pipe insulators that are measured in pounds per cubic foot. Is there anyway to convert pounds per cubic foot to pounds per square inch? So based off the density of the foam can i determine how much pressure is equivalent?
#8
08-18-2009, 03:03 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,439 Rep Power: 19
Re: Determining Pressure Based off Density

Quote:
 Originally Posted by Unregistered I am trying to calculate how much psi of air i would need in order to make a aluminum pipe float in a pool. I determined how much flotation is needed using pipe insulators that are measured in pounds per cubic foot. Is there anyway to convert pounds per cubic foot to pounds per square inch? So based off the density of the foam can i determine how much pressure is equivalent?
What you need to do is exclude water from the inside. If the pipe is sealed, you don't need any pressure inside, although if it has TINY leaks, some pressure inside will delay water intrusion through the leaks.

Air has weight and the more air you compress inside the pipe, the more it will weigh (although the change is relatively small).

Assuming you prevent water intrusion, it will float if it weighs less than the water it displaces (based on the gross or exterior volume of the sealed pipe.) Since aluminum is heavier than water, there has to be a large enough interior space filled with air or something light to average out.

In inflatable water toys, air pressure is important because it forces the toy into shape and establishes the sealed volume.
#9
05-25-2011, 01:04 PM
 Unregistered Guest Posts: n/a
Re: square inch to cubic foot

I am trying to convert inches of a box to cubic feet Example: 18"x18"x24"= cubic ft.
is this possible?
#10
05-25-2011, 03:12 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,439 Rep Power: 19
Re: square inch to cubic foot

Quote:
 Originally Posted by Unregistered I am trying to convert inches of a box to cubic feet Example: 18"x18"x24"= cubic ft. is this possible?
Sure. Two ways tyo do it (I prefer the 1st)

1) 1 ft = 12 in. Convert all measurements to feet and multiply
1.5 ft x 1.5 ft x 2 ft = 4.5 ft³

2) Multiply the inches 7776 in³
There are 1728 (12³) in³ in 1 ft³, divide by 1728, get 4.5 ft³

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