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Battery Weight?

johnnybev1987
johnnybev1987 Posts: 11,410
edited January 2010 in Not Sports Related
Hey everyone,

Was having a discussion earlier with someone(not very techinical) but whether a battery weight got less when used?
I have looked online, sad i know but still cant really get any good answers so just wondered what you lifers thoght.

Comments

  • WSS
    WSS Posts: 25,070
    If you laid in a bath and then filled it up, right to the rim - in the case that one more drop would make it overflow - then if you drunk a glass of water what would happen?
  • DaveMehmet
    DaveMehmet Posts: 21,595
    [cite]Posted By: WSS[/cite]If you laid in a bath and then filled it up, right to the rim - in the case that one more drop would make it overflow - then if you drunk a glass of water what would happen?

    The phone would ring
  • JT
    JT Posts: 12,348
    [cite]Posted By: DaveMehmet[/cite]
    [cite]Posted By: WSS[/cite]If you laid in a bath and then filled it up, right to the rim - in the case that one more drop would make it overflow - then if you drunk a glass of water what would happen?

    The phone would ring


    Don't bank on Nathan answering though...
  • eaststandmike
    eaststandmike Posts: 14,956
    [cite]Posted By: WSS[/cite]If you laid in a bath and then filled it up, right to the rim - in the case that one more drop would make it overflow - then if you drunk a glass of water what would happen?

    Nothing until you pissed yourself, then it would overflow!!
  • Dave Rudd
    Dave Rudd Posts: 2,865
    Drinking ... alone in the bath? It's not natural.

    Going back to the original question..... it is well-known that E=mc2, so the conversion of some of the battery's mass (weight is a force, of course, so mass is the correct term) into energy means that there is an overall reduction when the energy is removed. However, you get a lot of energy for a small amount of mass (as c - the speed of light - is such a large number), so the mass reduction of the battery would be so negligible that you'd struggle to detect it.

    Eat your heart out, Stephen Fry.
  • ValleyGary
    ValleyGary Posts: 37,975
    good god, if you applied that with some train knowledge you'd be crowned CAFC no.1 fan. ;-)
  • Dave Rudd
    Dave Rudd Posts: 2,865
    [cite]Posted By: ValleyGary[/cite]good god, if you applied that with some train knowledge you'd be crowned CAFC no.1 fan. ;-)

    Where did I put my 'Steam Engines of Paraguay' DVD?
  • johnnybev1987
    johnnybev1987 Posts: 11,410
    [cite]Posted By: Dave Rudd[/cite]Drinking ... alone in the bath? It's not natural.

    Going back to the original question..... it is well-known that E=mc2, so the conversion of some of the battery's mass (weight is a force, of course, so mass is the correct term) into energy means that there is an overall reduction when the energy is removed. However, you get a lot of energy for a small amount of mass (as c - the speed of light - is such a large number), so the mass reduction of the battery would be so negligible that you'd struggle to detect it.

    Eat your heart out, Stephen Fry.

    In fairness that is close to the best answer i have heard but in simpler terms, thanks for that! lol silly question i know and the other person says that energy has no weight so therefore there is no difference. in a way we are both right as it does change going by your answer even if by the smallest amount

    strange but just always feels like a used battery is lighter then a new battery does anyone else think that or just me?
  • johnnybev1987
    johnnybev1987 Posts: 11,410
    [cite]Posted By: WSS[/cite]If you laid in a bath and then filled it up, right to the rim - in the case that one more drop would make it overflow - then if you drunk a glass of water what would happen?

    I would have said that the water has no weight but it would go over due to your moveent or the weight of the glass no
  • ValleyGary
    ValleyGary Posts: 37,975
    [cite]Posted By: Dave Rudd[/cite]
    [cite]Posted By: ValleyGary[/cite]good god, if you applied that with some train knowledge you'd be crowned CAFC no.1 fan. ;-)

    Where did I put my 'Steam Engines of Paraguay' DVD?

    lol
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  • johnnybev1987
    johnnybev1987 Posts: 11,410
    as you may tell i was never one for science at school :-)
  • Dave Rudd
    Dave Rudd Posts: 2,865
    [cite]Posted By: johnnybev1987[/cite]strange but just always feels like a used battery is lighter then a new battery does anyone else think that or just me?

    There's no way that they would feel different
  • Oggy Red
    Oggy Red Posts: 44,954
    edited January 2010
    [cite]Posted By: johnnybev1987[/cite]
    I would have said that the water has no weight but it would go over due to your moveent or the weight of the glass no

    You evidently haven't carried an empty bucket in one hand, and a full bucket of water in the other.

    Try it Johnny .... you'll see what I mean.

    ;o)
  • johnnybev1987
    johnnybev1987 Posts: 11,410
    [cite]Posted By: Oggy Red[/cite]
    [cite]Posted By: johnnybev1987[/cite]
    I would have said that the water has no weight but it would go over due to your moveent or the weight of the glass no

    You evidently haven't carried an empty bucket in one hand, and a full bucket in the other.

    Try it Johnny .... you'll see what I mean.

    ;o)

    Oh yeah lol no comment, i am a bit stupid sometime ill be the first to admit it :-)
  • ShootersHillGuru
    ShootersHillGuru Posts: 50,619
    [cite]Posted By: Dave Rudd[/cite]Drinking ... alone in the bath? It's not natural.

    Going back to the original question..... it is well-known that E=mc2, so the conversion of some of the battery's mass (weight is a force, of course, so mass is the correct term) into energy means that there is an overall reduction when the energy is removed. However, you get a lot of energy for a small amount of mass (as c - the speed of light - is such a large number), so the mass reduction of the battery would be so negligible that you'd struggle to detect it.

    Eat your heart out, Stephen Fry.

    Quality reply
  • Dave Rudd
    Dave Rudd Posts: 2,865
    [cite]Posted By: johnnybev1987[/cite]
    [cite]Posted By: Oggy Red[/cite]
    [cite]Posted By: johnnybev1987[/cite]
    I would have said that the water has no weight but it would go over due to your moveent or the weight of the glass no

    You evidently haven't carried an empty bucket in one hand, and a full bucket in the other.

    Try it Johnny .... you'll see what I mean.

    ;o)

    Oh yeah lol no comment, i am a bit stupid sometime ill be the first to admit it :-)

    Or put some used batteries in the full bucket to lighten it up a bit?
  • johnnybev1987
    johnnybev1987 Posts: 11,410
    [cite]Posted By: Dave Rudd[/cite]
    [cite]Posted By: johnnybev1987[/cite]
    [cite]Posted By: Oggy Red[/cite]
    [cite]Posted By: johnnybev1987[/cite]
    I would have said that the water has no weight but it would go over due to your moveent or the weight of the glass no

    You evidently haven't carried an empty bucket in one hand, and a full bucket in the other.

    Try it Johnny .... you'll see what I mean.

    ;o)

    as u do

    Oh yeah lol no comment, i am a bit stupid sometime ill be the first to admit it :-)

    Or put some used batteries in the full bucket to lighten it up a bit?
  • Oggy Red
    Oggy Red Posts: 44,954
    [cite]Posted By: johnnybev1987[/cite]
    i am a bit stupid sometime ill be the first to admit it :-)

    Can we have that in writing, Johnny ?

    Oh, we just have, lolololol

    ;o)

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