×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

bouyancy of hydrogen & oxygen

bouyancy of hydrogen & oxygen

bouyancy of hydrogen & oxygen

(OP)
Is the bouyancy of one pound of oxygen the same under water as hydrogen and if so, how much? Would the depth affect the buoyancy?

RE: bouyancy of hydrogen & oxygen


I suggest you look for the well-known Archimedes' buoyancy principle in any book on Physics.

RE: bouyancy of hydrogen & oxygen

(OP)
A certain amount of hydrogen, when placed under oceanwater, will be compressed and become smaller and less bouyant the deeper it is placed underwater. Does anyone know the method or formula for figuring how much at what depth, for example, one pound of hydrogen at one foot deep, then ten then one hundred?

RE: bouyancy of hydrogen & oxygen

use simple gas law
PVT=P1V1T1

PVT is the standard atmospheric conditions
P1 - pressure due to column of water
i.e. density of water x height of the water column x 9.8 (gravity)
Let say the T=T1 then use can easily find the final compressed volume.

You are right if you compress the given sample it will become less buoyant but less compare to what? even if you liquify the hydrogen or lets say you use oil in place of compressed hydrogen, these will remain buoyant irrespective of the applied pressure.

under the similar conditions, hydrogen will always be less buoyant than oxygen

RE: bouyancy of hydrogen & oxygen


Thermcool says

Quote:

under similar conditions, hydrogen will always be less buoyant than oxygen

This appears to contradict intuition.
The buoyant force on an object equals the weight of the fluid displaced by the object, and since 1 lb of oxygen occupies less volume than the same mass of hydrogen, under equal P,T conditions, the seawater volume displaced by oxygen is smaller, and so is the buoyant force.

Thus, I"ll be grateful for an explanation to descry my conceptual error.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources