If you fill a metal container with helium, will it weigh less after it is full?
595563
Yes, it will weigh less. Fill ANY container with lighter-than-air gas, and it will weigh less.\n\nException: If the gas is under high pressure, such as in a pressurized tank, the container will actually weigh MORE.\n\nReason: Gas is compressible. If helium were half the weight of normal air, then helium under twice the pressure will weigh the SAME AS normal air under normal pressure. So if the pressure on the helium were increased, the container will weigh MORE.
983708
Are the containers the same mass? \nAre the contents of the container the same material?\n\nIf the answer to both questions is 'Yes' 1st, the motion of the molecules is the same but, 2nd, with the 200g there is twice as much energy in the water contents as you have twice as much .
520314
Yes...if you were playing a ball game in helium with less than .00001% of earth's sea level pressure the potential energy would be hugeley negative...of course the equipment needed to play such a game would be hard to design but you simply asked if a baseball can have negative gpe
899047
not so bad really. Eventually enough helium will leak out and the balloon will come down.\nThe balloon is so fragile I doubt it would hurt an airplane. \nMy only concern is what happens when the balloon comes down. Most of them are at least partially latex and that stuff takes a long time to break down. I do hope birds and other creatures don't get tangled in them, but I have never heard of such a thing.
562669
No, because there is always attraction between the molecules of the two opposite moving bodies. Vanderwaals force or adhesive force.\nThe least friction gives the super liquid Helium two. It does not thematter what the other material is.
177751
The particles in the dish and salt will expand when heated, or condense when cooled.  In this case the mass after it cooled down should be smaller
604015
The amount of material and the prevalent temperature haven't changed much, so the pressure and volume are inversely proportional.  As the external pressure on the balloon decreases, the amount of material in the balloon will expand to equalize that pressure.
163827
I would argue that it does not weigh less, actually, it "weighs" more.\n\nWeight is the force exerted in an object by gravity.  Weight is dependent on mass.  The mass of the rubber part of the balloon is constant, the only thing that effects the over all mass of the balloon is how much air it is filled with....the more air, the  more mass.\nSo a balloon filled with more air has a greater mass, thus a greater weight.\nWeight = mass * gravity,\nwhere gravity is the gravitational acceleration experienced by the object (9.81 m/s^2 on the surface of the Earth).
843613
No. At higher levels, the electron will get more potential energy as it is more separated from the nucleus. As the electron goes away from the nucleus the attraction between them decreases and the potential energy increases. But there is no change in the mass
978453
With Boyles law, doubling the pressure doubles the mass. No sure what the relative masses of air and helium are, but let`s say it`s 10 to 1, then 10x the pressure is what you need
1031597
That 1kg of hydrogen would convert to about 0.954 kg of helium, the other 0.046 kg is changed to energy.\n\nE=MC^2\nM=0.046 kg\nC=300,000,000 m/s\nE=4.14X10^15 joules\n  = 1,150,000,000 Kilowatt-hours
94588
It depends on various factors but most important would be pressure. As the balloon ascends into the upper atmosphere pressure is slowly reduced as the air gets thinner farther up the balloon goes, Pressure within the balloon where the helium is held soon expands out as the air molecules in the atmosphere reduces and at one point it will burst as the helium expands past the stretchability limit of the balloon. So it depends on how strong the balloon fiber is, how much helium is stored within the balloon, how thin is the surrounding atmosphere compared to pressure within the balloon and also if the balloon meets any obstruction on its way up.
265540
While helium itself doesn't actually defy gravity, it is lighter than air and floats upward as descending air pushes it out of the way. Like a bubble in water, the helium goes up to make room for the air going down. The buoyant force that acts on the helium is equal to the weight of air that the helium displaces.\n\nA cubic foot of air weighs about 0.078 pounds so the upward buoyant force on a cubic foot of helium is about 0.078 pounds. A cubic foot of helium weighs only about 0.011 pounds. The difference between the upward buoyant force on the cubic foot of helium and the weight of the helium is the amount of extra weight that the helium can lift; about 0.067 pounds. Since you weigh 85 pounds, it would take about 1300 cubic feet of helium to lift you and a thin balloon up into the air. That's a balloon about 13.5 feet in diameter.
372306
Depends on how much helium you put into it, and how big your baloon is, and how and where you release it, and... it may well heep going up and up and up to the top of our atmosphere if you put enough in.
786466
Yes.\n\nThere are two states for liquid helium. In the second state it has such a low surface tension that it does flow uphill.\n\nIf you put water in a glass and look at the very edge of the surface you will see it curve from flat, upward to the glass. The water molecules are being attracted to the glass, but are pulled back by attraction to other water molecules and gravity. With helium, this happens but the attraction to spead out is greater....
1139007
If you asked a scientist you might get a different answer than if you asked a layman.  Let's compare a kilogram of lead with a kilogram of aluminum.  You likely would use the same scale to measure both samples.  But, the aluminum is much lighter and would take up far more space than the lead.  The samples would displace different amounts of air and the buoyancy of air would affect the scale readings by a small amount.  Therefore to obtain accurate measurements you must weigh the samples in a vacuum or calculate the buoyancy and compensate the weight measurements.  If this is true for lead and aluminum it is even more true for lead and feathers (or even lead and butter).  Chemists often do have to compensate for air buoyancy when measuring chemicals so that when they react none are left over.
804421
The higher the balloon goes in the atmosphere the less pressure on the balloon. This causes the helium to expand its volume. If the balloon was filled to capacity it would *pop* at higher altitudes.