Recent content by Rodrigoson6

hi :) yes i have a hose coming from a base on ground. However i see the link that you posted, but it isn't a good idea for my project. What do you think about a image that i posted in the first page? today i thought that is better (to have only helium and delete air inside the aerostat) to put...

:(

the problem is that i don't want to mix the two gases (air and helium), so i would to know how slowly, i must flush the aerostat with Helium. To have a good result, i think that this operation i need to do it, with the aerostat in vertical position e not horizontal position. The weight's air...

see the imagine... is ok ?

ahhh... understand... but, is a problem if my aerostat is a torus ?? http://it.m.wikipedia.org/wiki/Toro_(geometria)

How slowly?

ah ok. I understand, excuse me but i don't speak and write english very well. So, for me, is very difficult. in the latest posts, you said that to have only Helium in the aerostat, i must pump it (inside aerostat) a large volume (like 10 times) very slowly... can you tell me, why very slowly...

Are you sure? If i have an rigid aerostat with a big Volume, you say that there is not a bayount force? So, the aerostat will be not up ?

you are right, it's good enough Helium 5.0 Now, however, 'I doubt: I just pumped helium for a few hours (wash) or I need to create a vacuum? and what material to use?

helium must be truly pure, I need to get the density (measuring pressure and temperature sensors), using the formula of van der waals (with the constants a and b). I can not afford that helium is not pure or that there is air in the aerostat. So if I understand correctly, the vacuum is not...

great idea! It is an aerostat, the height is varied in two ways: 1) valve for placing helium (high-pressure), to increase the density of the helium and bring down the aerostat 2) the outflow valve to decrease the density of helium and pick up the aerostat You're advising me to do so: 1) both...

I put helium in a balloon (with a maximum pressure of 1.5-1.7 atm), but I do not want changes in the volume, so I have to use a rigid material (non-elastic). To make sure that there is only helium in the balloon, I have to create a "strong vacuum." My fear 'that, in the material can break or...

Hi guys, (I apologize if I'm wrong here, and I apologize for my bad English but I'm Italian): if I have two container, where: container "A" (there is "He" with a pressure of 2 atm); container "B" (remember "O2" with a pressure of 1 atm). 1) you tell me which formula to use to calculate the speed...