/sci/ - Science & Math » Thread #12740024

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Anonymous Mon 22 Feb 03:35:18 2021 No.12740024 View Reply Original Report

Quoted By: >>12740043 >>12740169

Should a battery pack be heavier when its charged? Compared to empty.

If so then has someone calculated the weight of electricity? Any info to that.

Anonymous

Anonymous Mon 22 Feb 2021 03:40:02 No.12740034 Report

Quoted By:

Yes, the total mass of a battery increases when the battery is charged and decreases when it is discharged.
The difference boils to Einstein's E=mc2 that follows from his special theory of relativity. Energy is equivalent to mass and c2, the squared speed of light, is the conversion factor.

Anonymous

Anonymous Mon 22 Feb 2021 03:42:58 No.12740043 Report

Quoted By:

>>12740024
The mass of an electron is 10^(-31) kg. Even assuming you have a standard count of 10^(25) kg in your charged battery, you will see a difference of about 1 nanogram. So, yes there is increased mass. No, you won't notice.

Anonymous

Anonymous Mon 22 Feb 2021 03:44:53 No.12740047 Report

Quoted By: >>12740112

Doesn't charging a battery just separate the electrons from positive ions inside? Thus no net change in mass?

Anonymous

Anonymous Mon 22 Feb 2021 04:12:39 No.12740112 Report

Quoted By: >>12740118

>>12740047
the increase in potential energy also has its own mass

Anonymous

Anonymous Mon 22 Feb 2021 04:15:53 No.12740118 Report

Quoted By: >>12740125

>>12740112
potential energy does not have mass dumbass

Anonymous

Anonymous Mon 22 Feb 2021 04:19:13 No.12740125 Report

Quoted By:

>>12740118
adding potential energy to a system increases the mass of the system. i spoke casually

Anonymous

Anonymous Mon 22 Feb 2021 04:37:00 No.12740169 Report

Quoted By:

>>12740024
Theoretically yes, every form of energy has some amount of mass, but it's nearly undetectable at this scale.

For instance, the first car battery I found on Amazon had a charge of 75 Ah and a voltage of 12 V, so it can provide 3.24 MJ of energy, Via E=mc^2 that's equivalent of 3.6 * 10^(-11) kg, which is almost nothing, 36 nanograms (for a 14 kg battery)

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