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Have you weighed your MBP presicely?

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Pagga

Pagga

macrumors 6502
Original poster
Apple.com says 2.99 kilo or 6,59 pund for a 17" and 2.49 kilo or 5.48 punds for a 15"


My 17" (specs listed in sig) weighes exactely
2.97 kilograms or 6.54 punds


How about yours?

P
 
Don't forget that different kinds of data weigh more. Music weighs less than video and applications vary depending on whether they are Universal Binary or not. Free drive space, while not exactly weightless, weighs very little.
 
It would be interesting to see the difference in weight between a SSD and traditional HDD.

Tracer
 
Quote: "Don't forget that different kinds of data weigh more. Music weighs less than video and applications vary depending on whether they are Universal Binary or not. Free drive space, while not exactly weightless, weighs very little."

So your saying it´s a silly topic? What can I say, I like details
 
Did you do this when the MBP was on or off? Everyone knows that as it gets hotter, everything expands and gets bigger, thus weighing more. If you MBP were cold, that would explain the discrepancy.
 
Signal-11 said:
Did you do this when the MBP was on or off? Everyone knows that as it gets hotter, everything expands and gets bigger, thus weighing more. If you MBP were cold, that would explain the discrepancy.
Click to expand...

LOL... i so hope you're being serious.
 
Signal-11 said:
Did you do this when the MBP was on or off? Everyone knows that as it gets hotter, everything expands and gets bigger, thus weighing more. If you MBP were cold, that would explain the discrepancy.
Click to expand...

Size and weight have no correlation. Not in the terms your speaking in.
 
Signal-11 said:
Did you do this when the MBP was on or off? Everyone knows that as it gets hotter, everything expands and gets bigger, thus weighing more. If you MBP were cold, that would explain the discrepancy.
Click to expand...

LoL!!!!!!!!!! fell out of my chair laughing, sorry..

edit: things indeed do expand when heated, but it does not gain any more mass, so temperature does has no influence on weight.
 
Signal-11 said:
Did you do this when the MBP was on or off? Everyone knows that as it gets hotter, everything expands and gets bigger, thus weighing more. If you MBP were cold, that would explain the discrepancy.
Click to expand...

Just to clear thing up: The weight of an object depends on the quantity of matter that it contains. For example, 12 grams of pure carbon contain 1 mole of molecules (6.022 x 10^23 molecules). Now the volume occupied by this weight of carbon depends on its temperature and at what pressure it is measured. In fact, the hotter it is and the less the pressure is strong, the further apart the individual atoms will be and, hence, more volume will be occupied. The weight remains constant as the number of carbon atoms remain constant.
 
If you've got reeeaaallyyy sensitive scales the weight (or perceived weight at least) would actually decrease because of the increased buoyancy force, but thats on a whole new level of anal retentivity.
 
This is one of those untold truths about actual design that you guys don't get because you didn't go to a real engineering school.

This is one of the drawbacks of using all metal/aluminum housing like the Apple notebooks over the plastic designs of PC competitors. One, the coefficient of thermal expansion is higher in metals than in plastics so the Apples expand more. This is one of the reasons why your Mac feels so hot on your lap. As it expands, it touches more of your lap, thus increasing the thermal conductivity of the metal. It also pushes down into your lap more as it gets heavier. Notice how bacon sizzles more when you push down with the spatula? That's because its getting hotter as you push more weight onto it.

What you guys with your 9th grade physics understanding of F=ma don't get is that as an object gets bigger, there is more of it for gravity to pull on. That's the difference between Newton and Einstein.
 
Signal-11 said:
This is one of those untold truths about actual design that you guys don't get because you didn't go to a real engineering school.

This is one of the drawbacks of using all metal/aluminum housing like the Apple notebooks over the plastic designs of PC competitors. One, the coefficient of thermal expansion is higher in metals than in plastics so the Apples expand more. This is one of the reasons why your Mac feels so hot on your lap. As it expands, it touches more of your lap, thus increasing the thermal conductivity of the metal. It also pushes down into your lap more as it gets heavier. Notice how bacon sizzles more when you push down with the spatula? That's because its getting hotter as you push more weight onto it.

What you guys with your 9th grade physics understanding of F=ma don't get is that as an object gets bigger, there is more of it for gravity to pull on. That's the difference between Newton and Einstein.
Click to expand...

lol, you're trying to teach physics to someone with a masters in aerospace engineering and a year into a fluid mechanics PhD 😛. I think you might want to retake that 9th grade physics class.
 
kezman said:
lol, you're trying to teach physics to someone with a masters in aerospace engineering and a year into a fluid mechanics PhD 😛. I think you might want to retake that 9th grade physics class.
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I, too have an engineering degree and graduate degrees.

I, too have done some serious fluid mechanics at a graduate level. BUT, its a different field from materials science and relativity, which is what we're talking about.

Besides, you were the guy who was hoping I was being serious.
 
Signal-11 said:
What you guys with your 9th grade physics understanding of F=ma don't get is that as an object gets bigger, there is more of it for gravity to pull on. That's the difference between Newton and Einstein.
Click to expand...

Acceleration due to gravity (a) doesn't change, mass of the MBP (m) doesn't change, how would weight change when it's hot?

mcMacnewbie said:
my anti-glare 17" SSD weighs just over 6llbs!! A nice surprise 😛
Click to expand...

SSD are a bit lighter, and you're missing the giant sheet of glass, so you must have one of the lightest 17inch notebooks in the world, if you remove the superdrive, it will be even closer to the 15" MBP.
 
RKpro said:
Acceleration due to gravity (a) doesn't change, mass of the MBP (m) doesn't change, how would weight change when it's hot?



SSD are a bit lighter, and you're missing the giant sheet of glass, so you must have one of the lightest 17inch notebooks in the world, if you remove the superdrive, it will be even closer to the 15" MBP.
Click to expand...

When an object it hot, it moves air currents around them so there would be weight different vs. cold. It won't matter unless you have a digital scale that reads to the 0.001 g lol
 
Hydroxs said:
When an object it hot, it moves air currents around them so there would be weight different vs. cold. It won't matter unless you have a digital scale that reads to the 0.001 g lol
Click to expand...

so this topic is hardly worth the effort is it...
 
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