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Other => Off-topic => Topic started by: ClownSpider on January 19, 2017, 07:46:30 AM



Title: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: ClownSpider on January 19, 2017, 07:46:30 AM
Hello.
I am trying to solve an issue.
What is the formula to find the volume of air needed to float a given weight?
To make numbers easy I am asking how much volume in cubic centimeters CM3 is needed to float 1 pound (or 1 kg if you prefer all metric)  on water?



Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: ClownSpider on January 27, 2017, 10:42:51 AM
Anyone??


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: gadman2 on January 27, 2017, 11:07:13 AM
Disregard my first answer if you read it, I misunderstood the question. You want to know how much air is needed to keep 1 lb of weight floating on water.

Well there are a lot of questions you need to answer first. The most important being: What are you trying to float in water? The density of the whatever you are trying to float matters more than how much air you would need to keep it buoyant. Imagine 1 lb of Styrofoam will float without any extra buoyant material needed. Conversely, 1 lb of lead will without a doubt sink and require air (or any other buoyant material) to keep it floating.

https://en.wikipedia.org/wiki/Buoyancy Good luck!


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: Hydrogen on January 28, 2017, 02:02:09 AM
Hello.
I am trying to solve an issue.
What is the formula to find the volume of air needed to float a given weight?
To make numbers easy I am asking how much volume in cubic centimeters CM3 is needed to float 1 pound (or 1 kg if you prefer all metric)  on water?

As far as I know, its not a volumetric equation.

Its a density equation.

Something with a higher density than water (per surface area) will sink.

And vice versa.

But I could be wrong on that.



Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: notech on January 29, 2017, 08:46:25 PM
posting here to subscibe and check later result  ::)


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: ClownSpider on February 17, 2017, 03:24:55 AM
The item to float has a negative buoyancy.   Which anyone should have guessed.    Why would I ask if it was 1lb of foam?

Density is therefore irrelevant.  It obviously has a NEGATIVE density.
I do not want it to make contact with water.

I solved this myself using empty soda cans, and a cardboard box loaded with 1lb of rocks.
4 soda cans worth of air was the answer.
aka
48 fl oz to float 1 lb


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: Shankara on February 17, 2017, 06:36:59 AM
what matters is the density, not the height, so we need to know the material


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: ClownSpider on February 20, 2017, 11:17:39 PM
what matters is the density, not the height, so we need to know the material

WRONG.
Density only matters if you want to know IF something will float.
An educated person can see that YES I want it to float.
NOBODY said anything about height.  You must have confused volume for height measurement.
Such a mistake disqualifies you from problem solving with words and numbers.


Title: Re: How many cubic centimeters of air is needed to float 1 lb on water?
Post by: PokerDiceMan on February 20, 2017, 11:25:14 PM
what do you want need one cubic centimetres
one cubic centimetres is low, one cubic decimetres equal one liter, one kilograms