2006-12-27 08:36:21 · 10 answers · asked by mr b 1 in Science & Mathematics ➔ Chemistry
If a bottle has helium at atmospheric pressure rather than air, the bottle will be lighter than if it were filled with air (like a helium balloon). But it won't float due to the weight of the bottle. If you fill it with compressed helium, it will get heavier and heavier as the weight of the compressed helium increases. The more helium you force in under pressure, the greater the density will become and the more it will weigh.
2006-12-27 08:45:59 · answer #1 · answered by Laguna Tim 2 · 0⤊ 0⤋
Of course it does, doesn't He have negative mass. Realistically, it depends on what was in the helium gas bottle before it was filled with helium. If it was full of nothing - a vacuum - then it would weigh more by the amount of He that was added. If it was full of air, it would possibly weigh less depending on the mass of the air that was replaced and the mass (how much pressure, if you increase the pressure you can get more He in there) of the helium that replaces it.
Try this one. Weigh a balloon on a triple pan balance. Make sure to stick a small piece of tape to the balloon. Inflate the balloon and roll the piece of tape into a cylinder so you can stick the balloon to the balance. It will weigh measureably more since the air in the balloon replaced nothing.
2006-12-27 08:44:35 · answer #2 · answered by kentucky 6 · 0⤊ 0⤋
Remember that a helium balloon is a kind of gas bottle.
If the bottle is full of helium at 1 atm pressure, it will weigh somewhat less that the same bottle *full of air* at 1 atm pressure. It will *not* weigh less than the same bottle closed with a vacuum inside.
You can calculate how much less from the ideal gas law and by knowing the molecular weights of the gases involved.
2006-12-27 11:42:34 · answer #3 · answered by Jerry P 6 · 0⤊ 0⤋
Not being a physicist, I'm guessing that "weight" is a function of pressure measured relative to gravity. PPSI...(pounds per square inch) I think, is what is used to determine this. Since a deflated baloon sits entirely on the ground, registering more PPSI as opposed to when it is full of hot air (or helium) and is aloft; then I would say yes, a full helium bottle weighs less than when it's empty. The helium is lighter than air and slightly "pushes" the bottle up with it, thus decreasing somewhat the PPSI of the bottle when empty (or full of air ... which exists at ground level).
2006-12-27 08:51:37 · answer #4 · answered by Jon L 1 · 0⤊ 0⤋
Helium Gas Cylinder
2016-12-10 15:40:37 · answer #5 · answered by ? 4 · 0⤊ 0⤋
No. Although helium at normal atmospheric pressure is lighter than the same volume of air, the helium in the gas bottle is compressed. If it was compressed 100 to 1, there would be 100 lots of helium in the bottle and it would be 100 times the weight of 1 lot of uncompressed helium, and probably heavier than 1 lot of air.
2006-12-27 08:44:27 · answer #6 · answered by ricochet 5 · 0⤊ 0⤋
Yes.
It will weigh the least if it's sealed and there's a vacuum inside (NO gas at all).
But the difference between it having "air" at, say, 50psi and helium at 50psi would be so little as to be almost undetectable, but there will be a difference.
Keep in mind, though, that an open helium gas bottle that has uncompressed air in it will weigh LESS than one with pressurized helium in it, since unpressurized air isn't very dense :)
2006-12-27 08:43:32 · answer #7 · answered by Anonymous · 0⤊ 0⤋
No it will weigh more because you are adding mass. Helium is only lighter than air at atmospheric pressure. Once it's compressed it's density goes up.
2006-12-27 08:42:32 · answer #8 · answered by scubamasterme 3 · 0⤊ 0⤋
Bottled gases are compressed and sometimes become liquid during compression. Of coarse it weighs more. Consider a Full scuba tank will sink, but an empty one will float...
2006-12-27 08:45:11 · answer #9 · answered by Anonymous · 0⤊ 0⤋
no............................?
2006-12-27 08:38:30 · answer #10 · answered by Anonymous · 0⤊ 0⤋