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When dealing with volume this should make you think about 3-dimensional objects. Objects like spheres, prisms, pyramids with their 2-dimensional counterparts being circles and various polygonal shapes.

The 3-dimensional object in your question is a sphere. Since you mentioned diameter that automatically means you are dealing with a circle in 3-dimensionals which is a sphere.

You are given the diameter to equal 8 inches. You need your answer in meters. You first step is to convert inches to meters. When converted 8 inches equals 0.2032 meters.

Now currently you only have the diameter of the sphere which is 0.2032 meters. To find the volume you need to use the formula four thirds pi radius cubed. This is the formula written algebraically...

Vsphere = (4/3) x (3.14159) x r3

The radius is equal to half of the diameter... therefore your radius is equal to 0.1016 meters. just plug that into your equation and you have your per meter volume.

Vsphere = (4/3) x (3.14159) x (0.1016)3

vsphere = 0.00439 m3

Q: What is per meter volume of 8 inches diameter?

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Approx 21.2 cubic inches.

A pipe with an inside diameter of 2 inches has 37.7 cubic inches (rounded) of interior volume per foot. That means about 6feet 1.5inches per gallon.

About 39.37 inches per meter.

Assuming that 0.75 inch refers to the diameter, the volume is pi*(0.75/2)2*12 = 5.3 cubic inches, approx.

1 meter=39.3700787 inches

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Approx 21.2 cubic inches.

A pipe with an inside diameter of 2 inches has 37.7 cubic inches (rounded) of interior volume per foot. That means about 6feet 1.5inches per gallon.

The volume is 3,848 cubic inches per linear inch of 70-inch diameter pipe. In terms of liquid volume, this pipe would contain 16.66 gallons of liquid per linear inch.

There are approximately 39.37 inches in one meter.

Approximately 39.37 inches per meter.

About 39.37 inches per meter.

About 39.37 inches per meter.

25.5mm

Completely filled, (pi x radius squared x length in inches)/231 cu in per gallon = gallons = 13.06122449, if the inside diameter of the pipe is 2 inches. =========== Of course that assumes that the inside diameter is exactly 2 inches. For real pipes, the actual inside diameter of a pipe depends on the "schedule" of the pipe. For a "nominal" pipe diameter of 2 inches, the outside diameter will be 2.375 inches and the wall thickness could vary from .065 inches (schedule 5) to .343 inches (schedule 160) meaning that the actual inside diameter could vary from 2.245 inches to 1.689 inches.

To calculate the volume of water in a pipe, first convert the diameter to feet (28 inches = 2.33 feet). Then use the formula for the volume of a cylinder (V = πr^2h) where r = radius (half the diameter) and h = height. For a 2.33-foot diameter pipe and 1 foot height, the volume is roughly 17.19 gallons of water per foot.