Register to reply

Weightless Vacuum Container maximum height

by cantRemember
Tags: container, height, maximum, vacuum, weightless
Share this thread:
cantRemember
#1
Dec21-12, 06:02 AM
P: 13
Assume you have a weightless constant volume container "filled with" vacuum. If you let it float in the atmosphere, how "high" would it go? I guess at some point Archimedes' principle should fail. What do you think?
Phys.Org News Partner Physics news on Phys.org
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
sophiecentaur
#2
Dec21-12, 06:32 AM
Sci Advisor
Thanks
PF Gold
sophiecentaur's Avatar
P: 12,185
Hi
If this thing is completely 'weightless' (a thought experiment) then there is no limit to where it would end up. It would always be displacing some weight of atmosphere. The atmosphere of a totally isolated Earth 'goes on' for ever and there would always be a pressure difference between nearer and more distant sides of the box which would produce an outward force .
As real high altitude balloon flights show, the practical limit is around 50km; not very far at all but of course that's not a 'weightless' box of vacuum.


Register to reply

Related Discussions
Calculate new water height in container after adding floating object Classical Physics 1
Solving a Projectile given only the initial height, maximum height, & horiz distance Classical Physics 9
Condensation in vacuum container General Physics 2
Vacuum container. Mechanical Engineering 7
Relating pressure and height in a container Introductory Physics Homework 3