Find the thickness of Aluminium Foil...


by Turvey
Tags: aluminium, foil, thickness
Turvey
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#1
Sep6-05, 02:15 PM
P: 9
This question comes from my Grade 11 Univ. Physics Teacher.

Problem: To as many significant figures as you can justify, determine the thickness of the aluminium foil.

1. Purpose
2. Procedure
3. Calculations (Significant Figures)
4. Conclucion



Now I know that the density of Aluminium is 2.7g/cm^3.

And I also know that the formula for cm^3 is Length X Width X Thickness.

So if i find the mass, multiply it by the density, and divide it by the length and the width, will I come out with the thickness?

He said there are many ways to do this and this is the only one I could come up with so any input or help would be much appreciated.

Regards;

Patrick
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NewScientist
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#2
Sep6-05, 02:42 PM
P: 246
Fold some foil over and measure with a micrometre and divide by number of folds
EnumaElish
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#3
Sep6-05, 03:35 PM
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Quote Quote by Turvey
So if i find the mass, multiply it by the density, and divide it by the length and the width, will I come out with the thickness?
I am not a physicist but the answer seems to be yes.

As a check-up, you can submerge it in water and measure displacement. Then work backwards from volume to thickness.

If you perform both methods, then you can have a range (low estimate and high estimate).

Turvey
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#4
Sep6-05, 07:00 PM
P: 9

Find the thickness of Aluminium Foil...


Quote Quote by NewScientist
Fold some foil over and measure with a micrometre and divide by number of folds
This was my first idea, but then he said there are many other ways so I was hoping to think of something to do that others would not.
NewScientist
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#5
Sep7-05, 02:10 PM
P: 246
Measure the foil length and width and then place it into a full measuring cylinder and collect the displaced water. You now have the volume of foil, the length and width and so can find thickness
hypermorphism
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#6
Sep7-05, 02:53 PM
P: 509
Quote Quote by Turvey
...
So if i find the mass, multiply it by the density, and divide it by the length and the width, will I come out with the thickness?
...
density=mass/volume, so volume = mass/density, not density*mass. Though you'll need a very accurate scale or a sizeable amount of foil to measure the mass accurately.
Turvey
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#7
Sep7-05, 08:57 PM
P: 9
Well I just measured the foil and I came out with 2.7 grams.

Here is what I have so far:

Lenth: 30cm
Width: 21cm
Mass: 2.7g
Density: 2.7g/cm^3.

Am I missing any vital information?

Im sorry to ask for help with it comes to the forumla and such, but I'm really stuck on this one, been working on it for 2 days :P

I was told that you calculate the Area, (Length*Width*Height), then multiply together the Mass and the Density.

density=mass/volume, so volume = mass/density, not density*mass. Though you'll need a very accurate scale or a sizeable amount of foil to measure the mass accurately.
Ahh, I'm so confussled :(



*I got it. Thanks to all that helped, much appreciated :)*


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