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The volume of a packet of crisps watch

1. Okay so I'm doing a project in A2 Use of Maths, and for my project I need an aproximate value for the volume that an average sized packet of crisps would fill. Currently, I don't have a clue. It doesn't really matter how the volume is worked out.

If someone could give me an aproximate value that would be awesome. c:

2. is the equation for the volume of a sphere. Where V is the volume and r is the radius. So if you have a value for the radius of the of the packet you will get an approximate volume. A crisp packet could be made into a spherical shape so I don't see why the above equation would not work.
3. Fill an empty bag of crisps with water and measure the volume of water needed to fill it
1 ml = 1 cm^3

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4. As people have said, fill it with water so it forms a sphere and then use the eqaution for the volume of a sphere. I don't think it's quite a2 though.
5. (Original post by Liamnut)
As people have said, fill it with water so it forms a sphere and then use the eqaution for the volume of a sphere. I don't think it's quite a2 though.
It won't form a sphere and it doesn't need to. It might leak though!
6. Fill a container with water then sink a sealed bag of crisps in it so some of the water is displaced.
Measure how much water is required to refill the container
Eureka

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7. Can't you shape it like a cuboid and find an approximation from that?
8. (Original post by gdunne42)
Fill a container with water then sink a sealed bag of crisps in it so some of the water is displaced.
Measure how much water is required to refill the container
Eureka

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Nice idea but I'm sure the crisps will float.
9. I'm sure you could do something needlessly complicated using volumes of revolution if you wanted to magic it to A2 standard
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EDIT: sorry my alpine marmot Eric got to the keyboard
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11. (Original post by Mr M)
Nice idea but I'm sure the crisps will float.

not if you attach a weight to them which is greater than the weight of the water the bag of chips has to displace (leave the weight in though so it continues to displacing the same amount of water). so you could probably find a 5 pound weight and attach a clothes pin or some kind of spring loaded clamp to it so you can easily release the crisps and it'll probably submerge the bag.
12. (Original post by Mr M)
Nice idea but I'm sure the crisps will float.
Push it in?
13. Turn on your tap so water is flowing out at a steady rate. Time how long it takes to fill up a bag of crisps, then fill up a cylindrical class for the same amount of time with the tap flowing at roughly the same rate and then calculate the volume of water in the class.

The volume of water in the crisp should be approximately the same as the volume of water in the cup if you managed to time it correctly and get water flowing out at a reasonably steady rate.
14. (Original post by Lord Frieza)
Can't you shape it like a cuboid and find an approximation from that?
BINGO! (ish)

take the (empty) bag of crisps and split it down each side.

measure the length and breadth and multiply these together.

Divide this by 6 (this will give you the (approximate) area of each square needed to form a cube).

Take the square root of this (this will give you the approximate length of the cube`s side.)

Cube it, and.....

(i`ve already done it)

(be interested to see what anyone gets for a (average) 14g bag) - packet of Ringos!

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Updated: January 23, 2014
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