The point is that helium doesn't create lift. That's saying that helium creates a force on itself - which makes no sense.
>right , if helium doesnt creat lift, then why when i put helium in a >baloon it rises? if i dont put helium in a baloon it doesnt rise? so how I don't think that a bike frame would hold much more helium than a baloon, and even then it's only lifting a rubber baloon weighing a couple of grams. The lift on a 10kg bike would be negligable. But then again, so would the weight saving of a vacuum in the frame! - Tom PS Good thing we have these pointless debates to mill over or else I'd probably get pretty bored :) mark krawczuk wrote: >dunno. i pesume that it would stay on the floor because there is helium >every where. >of course helium + helium = helium > > yes , but wwhat about a ballon full of helium, in earths normal >atnmosphere? it floats!!! so helim floats. > i think we where talking about helium filled tyres? who wants to drive with >helium filled tyres in a helium filled enviroment? > > mark k >----- Original Message ----- >From: "Tom Richardson" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Monday, June 24, 2002 11:39 AM >Subject: Re: nitrogen filled tires > > >>Mark, >> >>Imagine a room full of helium. Now place a baloon full of helium in it. >> What happens? >> >>- Tom >> >>mark krawczuk wrote: >> >>>right , if helium doesnt creat lift, then why when i put helium in a >>>baloon it rises? if i dont put helium in a baloon it doesnt rise? so how >>> >i > >>>figure it helium creats lift............ >>> >>> mark k >>>----- Original Message ----- >>>From: "Tom Richardson" <[EMAIL PROTECTED]> >>>To: <[EMAIL PROTECTED]> >>>Sent: Sunday, June 23, 2002 11:50 PM >>>Subject: Re: nitrogen filled tires >>> >>> >>>>Helium does not create lift. Rather, the force on the helium molecules >>>>(due to gravity) is smaller because it has a lower mass than air. Think >>>>of holding a ball underwater. >>>> >>>>Substitue the mass of a vacuum (zero) into this equation: force = mass * >>>>acceleration and you'll see what I mean. >>>> >>>>- Tom >>>> >>>>James Cox wrote: >>>> >>>>>Hum.. I don't know about that, sure that may hold true with no >>>>>athmosphere but helium being lighter than air, creates lift, and thus >>>>>less weight, even though the mass would be larger. >>>>> >>>>>(I got no idea how we got into this discussion on a Datsun forum!) >>>>> >>>>>James Cox >>>>> >>>>> >>>>>>Yes. A frame full of helium would have more mass than a frame under >>>>>>complete vacuum, therefore gravity would exert a larger force on the >>>>>>helium cos of one of Newton's laws, Force = mass * acceleration (ie >>>>>> >>>even >>> >>>>>>though helium is lighter than air, it's still heavier than nothing) >>>>>> >You > >>>>>>can't really use vacuum filled tyres though :) >>>>>> >>>>>>Aren't these digressions great? Who'd have thought there was a use for >>>>>>high school physics >>>>>> >>>>>>- Tom >>>>>> >>>>>_________________________________________________________________ >>>>>Join the world's largest e-mail service with MSN Hotmail. >>>>>http://www.hotmail.com >>>>> >>>>>--membersozdat------------------------------------------------------- >>>>>OZDAT Mailing List Please Note:- >>>>>Send (un)subscribe requests to [EMAIL PROTECTED] >>>>>Send submissions to [EMAIL PROTECTED] >>>>>No unauthorised redistribution of this email >>>>>http://www.ozdat.com/ozdatonline/index.htm >>>>>http://www.ozdat.com/ozdatonline/listindex.html >>>>>http://www.mail-archive.com/[email protected]/ >>>>>--------------------------------------------------------------------- >>>>> >>>> >>> >> >> > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
