Re: Energy and Mass
- From: srp@xxxxxxxxxxxx
- Date: 11 Feb 2007 08:42:24 -0800
On 11 fév, 10:21, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx> wrote:
When one measures mass of an object does it include measuring the energy
that the object contains? (Since mass and energy are "equivilent")
Yes. To obtain the energy (in joules) you only need to multiply the
mass
obtained by c^2 (the speed of light squared= 8.987551787E16)
Suppose I have a measure the mass of a box and then I "put" some energy in
it. When I measure it will I get a different mass?
If this could be done, then yes, but for all practical purposes, the
difference
would be infinitesimal.
Adding energy in context means heating the box. Or setting it in
motion
(motion implies adding energy) which would make the increased mass
hard to physically measure.
If thats the case then doesn't the bonds in an atom increase its mass more
than by just using the atomic mass?
Actually, they sort of decrease slightly.
That is, say we are using carbon as our material and we measure out one mole
then we would say there are avagadro's number of atoms there. But if energy
is equivilent to mass then aren't we overestimating? (because all thsoe
bonds that exist will have energy = mass but do not represent the true mass
of just the atom)
The difference borders the infinitesimal.
Ofcourse maybe the overall error is insignificant but I'm just wondering if
my logic is correct?
Just about.
Thanks,
Jon
André Michaud
.
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