Mobile Phones weight more when Charged

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Do mobile phones wegh more when charged for some reason? Mine always
feel heavier?
THanks,
Phil

 

[john jardine]

Do mobile phones wegh more when charged for some reason? Mine always
feel heavier?
THanks,
Phil

Yes. They do weigh a tad more, though I doubt it's enough to notice.
john

 

[Wim Lewis]

Yes. They do weigh a tad more, though I doubt it's enough to notice.

I'm guessing it's just psychological in Phil's case. The weight of the
energy (ala e=mc^2) would be, uhhh, about 20 kJ = 0.0000000002 grams.

Some battery chemistries use the surrounding air in their reaction,
don't they? So if you had a zinc-air cell phone battery, might it weigh
more when charged? Doubtless still too little to detect without an
instrument, though.

 

[Homer J Simpson]

Some battery chemistries use the surrounding air in their reaction,
don't they? So if you had a zinc-air cell phone battery, might it weigh
more when charged?

When exhausted perhaps? As air combines with the zinc?

 

[jasen]

Do mobile phones wegh more when charged for some reason?

Yes, E=mc^2

Mine always feel heavier?

Odd, the difference shouln't be noticable (or even measurable)

Bye.
Jasen

 

[sundar]

Yes, E=mc^2

Is E=mc^2 actually applicable here? I think not... What it actually
says is that when an energy E is 'converted' into an equivalent mass
you get a mass m=E/(c^2). Here in this case, the energy is stored as
energy itself - as electrostatic energy between the terminals of the
battery. The charges too do not get 'introduced'. They just get
unbalanced so that they have to use the external circuit we are going
to connect to get balanced. So it seems that no mass gets added,
either due to the energy added or due to charge seperation. This can't
account for the mobile feeling heavier, but may be there's some
complicated reason for that one, or may be it's simply psychology...

 

[jasen]

Is E=mc^2 actually applicable here?

it is.

I think not... What it actually says is that when an energy E is
'converted' into an equivalent mas you get a mass m=E/(c^2).
Here in this case, the energy is stored as energy itself
???

- as electrostatic energy between the terminals of the
battery.

no, as chemical potential energy - reconfigured molecules inside the
cells.

Bye.
Jasen

 

[Sjouke Burry]

Is E=mc^2 actually applicable here? I think not... What it actually
says is that when an energy E is 'converted' into an equivalent mass
you get a mass m=E/(c^2). Here in this case, the energy is stored as
energy itself - as electrostatic energy between the terminals of the
battery. The charges too do not get 'introduced'. They just get
unbalanced so that they have to use the external circuit we are going
to connect to get balanced. So it seems that no mass gets added,
either due to the energy added or due to charge seperation. This can't
account for the mobile feeling heavier, but may be there's some
complicated reason for that one, or may be it's simply psychology...

Yep. As soon as relations between particles change
and because of that total energy changes, total mass
changes.
No loopholes have been found anywhere in physics.

 

[Homer J Simpson]

No loopholes have been found anywhere in physics.

Black holes? Vortexes?

 

[Sjouke Burry]

Black holes? Vortexes?

You have a problem with black holes and vortices in
your batterycharger?
And those are not loopholes in energy storage and
conversion.

 

[Michael]

Do mobile phones wegh more when charged for some reason? Mine always
feel heavier?
THanks,
Phil

Cell phones seem to weigh the least when fully charged and the most when battery
is dead. Haven't you noticed that even the most rabid cell talker eventually
tires of holding that silly blob against his/her head and that nobody cares to
do that at all when the battery is depleated? <G>

No, a fully charged "cell" is heavier than a dead one, for the same reason that
a freshly washed and waxed car runs better than a dirty one.