# floation facter fluid ounces to cubic inches

Discussion in 'Wooden Boat Building and Restoration' started by rasorinc, Oct 28, 2012.

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### rasorincSenior Member

My 70+++year old brain is letting me down today on what should be a simple math question.
KNOWN FACTS: 1 fluid ounce is 1.8046875 cubic inches
64 fluid ounce plastic bottle holds 115.5 cubic inches
( 64 x 1.8046875 = 115.5 C" )= 1/2 US gallon
1 US gallon has 231 cubic inches
1 cubic foot has 1728 C" and if it is air will float 62
lbs in fresh water.
So what will my empty 64 oz. plastic bottle float????????? Back again. I just divided 231 by 1728 and got 13.36 so 231 is 13.36% of a cubic foot. 62 lbs. flotation x 13,36% = 8.28 pounds of flotation 1/2 of that is 4.14 pounds of flotation. Is that correct????

Last edited: Oct 28, 2012
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### txriverratSenior Member

I gallon of water weighs 8.35 lbs so that is what iit will float
Ron
I know atmosferic presure will very this a minute amount

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### rasorincSenior Member

My empty 64 ounce bottle is equal to 1/2 gallon so it will float 4.17 lbs.?????

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5. ### Submarine TomPrevious Member

Simply convert your knowns to metric and it will all be MUCH easier.

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### rasorincSenior Member

Thanks everyone, I think I have it figured out now. Tom, I'll learn metric when you learn to draw in LeRoy. I really appreciated the asistance.

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