Australian (ASX) Stock Market Forum

Science questions answered for laymen

Joined
Apr 21, 2005
Posts
3,922
Reaction score
3
This thread can be for science questions we laymen might have regarding science.

First question:

In the vacuum of space that would be encountered in an Earth orbit would:

a. a water bubble or oxygen bubble (gas bubble) move in an undirected way without evident force?
b. a water bubble or oxygen bubble (gas bubble) move in a direction evident as though it had force propelling it?

This scenario could be applied to, say a space walk or inside a vehicle capable of carrying man. Even these guys:alien2:
 
Joined
Jun 25, 2007
Posts
829
Reaction score
0
This thread can be for science questions we laymen might have regarding science.

First question:

In the vacuum of space that would be encountered in an Earth orbit would:

a. a water bubble or oxygen bubble (gas bubble) move in an undirected way without evident force?
b. a water bubble or oxygen bubble (gas bubble) move in a direction evident as though it had force propelling it?

This scenario could be applied to, say a space walk or inside a vehicle capable of carrying man. Even these guys:alien2:
I like it - a science nerds thread:D

I would have thought that the Brownian motion of the water molecules inside the droplet may impart some motion on the droplet, BUT the net force of the molecules hitting the inside surface may in fact be zero.

A great video of water in zero g -

http://www.youtube.com/watch?v=cXsvy2tBJlU

PS How do I embed a video in a post?
 
Joined
May 1, 2007
Posts
2,904
Reaction score
45
This thread can be for science questions we laymen might have regarding science.

First question:

In the vacuum of space that would be encountered in an Earth orbit would:

a. a water bubble or oxygen bubble (gas bubble) move in an undirected way without evident force?
b. a water bubble or oxygen bubble (gas bubble) move in a direction evident as though it had force propelling it?

This scenario could be applied to, say a space walk or inside a vehicle capable of carrying man. Even these guys:alien2:
Ok I'll bite:

First of all there would be no such bubble, the vacuum of space would make it explode.
Excluding centrifugal force, I don't think theres any force propelling it in any specific direction. (assuming it doesnt fall out of orbit)
 
Joined
Apr 21, 2005
Posts
3,922
Reaction score
3
Ok I'll bite:

First of all there would be no such bubble, the vacuum of space would make it explode.
Excluding centrifugal force, I don't think theres any force propelling it in any specific direction. (assuming it doesnt fall out of orbit)
Thanks skyquake.:) So a gas bubble would burst or a water bubble would burst or both? Wouldn't the water bubble just float like in the video posted aboove by jonojsp? Thanks jono.:)
 
Joined
Aug 29, 2006
Posts
860
Reaction score
113
This thread can be for science questions we laymen might have regarding science.

First question:

In the vacuum of space that would be encountered in an Earth orbit would:

a. a water bubble or oxygen bubble (gas bubble) move in an undirected way without evident force?
b. a water bubble or oxygen bubble (gas bubble) move in a direction evident as though it had force propelling it?
If it's in Earth orbit it would have a force acting on it, Gravity. How long it stays in orbit depends on its speed.

So on Earth an oxygen bubble in water that rises rather quickly is propelled by what force?
Air is lighter than water.
 
Joined
Jan 31, 2007
Posts
411
Reaction score
0
Thanks Naked shorts. So on Earth an oxygen bubble in water that rises rather quickly is propelled by what force?
If I understand your question correctly........ the answer is buoyancy as explained by Archimedes Principle, which is in summary caused by the differential pressure forces (due to the water) at the top and bottom of the bubble.
 
Joined
Apr 21, 2005
Posts
3,922
Reaction score
3
If it's in Earth orbit it would have a force acting on it, Gravity. How long it stays in orbit depends on its speed.

Air is lighter than water.
Thanks Spooly. Is there gravity in the vacuum of space?

For example:

An air bubble comes from the helmet of a cosmonaught as he is doing a space walk. Would that bubble explode? or move because of the gravity force of the Earth due to being in orbit?

And more importantly what would become of that cosmonaught?

If I understand your question correctly........ the answer is buoyancy as explained by Archimedes Principle, which is in summary caused by the differential pressure forces (due to the water) at the top and bottom of the bubble.
Thanks Buddy.
 
Joined
Jun 18, 2008
Posts
1,071
Reaction score
2
Thanks skyquake.:) So a gas bubble would burst or a water bubble would burst or both? Wouldn't the water bubble just float like in the video posted aboove by jonojsp? Thanks jono.:)
The bubble of liquid water would turn into a gas if exposed to the vacuum of space. This is because there is no pressure forcing the molecules together.
 
Joined
Jan 31, 2007
Posts
411
Reaction score
0
Thanks Spooly. Is there gravity in the vacuum of space?
Aah, gravity. It's everywhere, it's everywhere!

An air bubble comes from the helmet of a cosmonaught as he is doing a space walk. Would that bubble explode? or move because of the gravity force of the Earth due to being in orbit?
It wouldn't really "explode", more like disperse into the vacuum of space. The "air" is subject to exactly the same gravitational forces as the guy with the helmet.

And more importantly what would become of that cosmonaught?
Gotta watch those peskie Russian cosmonauts. If the "air bubble" is under significant pressure, the Ruskie might find himself going backwards at a significant rate of travel. Newton's laws and all that. :D
 
Joined
Mar 31, 2009
Posts
73
Reaction score
0
The bubble of liquid water would turn into a gas if exposed to the vacuum of space. This is because there is no pressure forcing the molecules together.
Would've thought that the bubble of liquid water would freeze before it had time to turn into gas and escape into the vacuum of space, as long as there were no sunlight, hence there is a force holding the molecular chains together. The real temperature in space is about 3 °K (-270 °C or three degrees Celsius above Absolute Zero). Absolute zero is the temperature in outer space without any sunlight. In sunlight the temperature can rise to 120 °C/ 250 °F (So typically the liquid water bubble would be turned gaseous). There are still molecules in space just very few of them.:cool:
 
Joined
May 1, 2007
Posts
2,904
Reaction score
45
Would've thought that the bubble of liquid water would freeze before it had time to turn into gas and escape into the vacuum of space, as long as there were no sunlight. The real temperature in space is about 3 °K (-270 °C or three degrees Celsius above Absolute Zero). Absolute zero is the temperature in outer space without any sunlight. In sunlight the temperature can rise to 120 °C/ 250 °F (So typically the liquid water bubble would be turned gaseous). There are still molecules in space just very few of them.:cool:
A ball of ice exploding?

Depends how the ball of water got up there in the first place.
Hollywood has imprinted too much floating globs of water in space stereotype :(
 
Joined
Mar 31, 2009
Posts
73
Reaction score
0
A ball of ice exploding?

Depends how the ball of water got up there in the first place.
Hollywood has imprinted too much floating globs of water in space stereotype :(
Well, if you think of it, comets are exploding balls of dirt and ice. The coma and tail of the comet is the ice evaporating into space when heated by the sun on it's approach.
 
Joined
Apr 24, 2009
Posts
1,114
Reaction score
0
How about a new question... if you were to travel at the speed of light, is it possible to travel back in time?
 
Joined
May 1, 2007
Posts
2,904
Reaction score
45
Well, if you think of it, comets are exploding balls of dirt and ice. The coma and tail of the comet is the ice evaporating into space when heated by the sun on it's approach.
Yup, that water was already attracted to the comet by gravity and was already frozen.

However if you magically get a 'ball' of water into space, would it freeze first or dissipate or explode?
 
Top