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I hope you can help me please. I have an AA battery here that has a weight of 10 grams, I would like to know what 10 grams of weight is equals to in air pressure like mill bar or PSI, can you help please?

Many thanks in advance

Christopher

- Thread starter avoinvents
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- #1

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I hope you can help me please. I have an AA battery here that has a weight of 10 grams, I would like to know what 10 grams of weight is equals to in air pressure like mill bar or PSI, can you help please?

Many thanks in advance

Christopher

- #2

Cyosis

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Specify the surface area.

- #3

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I have drawn 2 pictures I would like to show you, but I’m not sure how to upload them to you? May I have an email address for you please? The pictures are of two mats filled with air, one is 12” x 12” and the other mat is 24” x 24”, and both are attached to independent air pressure sensors. If I apply 98mN of force to both mats of air, will I get the same pressure reading from both sensors? What I’m trying to say is, even though the surface area on one mat is bigger than the other, the force 98mN is still the same being applied, so the pressure reading should be the same right?

- #4

Cyosis

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The air pressure would not be the same. Think about it this way. The same force will be spread over a larger surface. Therefore the force per meter^2 or in your case force per inch^2 will be less for the big mat. This is exactly what pressure is.

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- #6

Cyosis

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Newton is an SI unit so if you use Newtons you have to use square meters this results in pressure having Pascal as unit.

Edit: Since I never use the American/Imperial system myself I looked it up and if you want to divide by square inches you need to use pound force as the unit of force. This will result in psi being the unit of pressure.

Edit: Since I never use the American/Imperial system myself I looked it up and if you want to divide by square inches you need to use pound force as the unit of force. This will result in psi being the unit of pressure.

Last edited:

- #7

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If you want to do the units correctly, then you don't actually divide by 144 -- you divide by 144

Since you are dividing 98 mN by 144 in

It's best to stick with one of the more commonly used force units:

PSI

N/m^{2} = Pascals

Torr = mm Hg

atmospheres

bars

millibars

(Not sure if I left any out here.)N/m

Torr = mm Hg

atmospheres

bars

millibars

- #8

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I understand the part where i have to convert the weight into force but i have no idea on how to convert the force into air pressure. Could someone please try and explain to me step by step in plain english.

The measurement of 12 inches by 12 inches is incorrect it should be cm, but the square route is still 144. Even though the mat is 12 x12 i forgot to mention that it is also 4cm thick.

Could i please get step by step help, it would be very much appreciated.

Thank you all again in advance.

- #9

Cyosis

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I used this online converter to convert 10 gram/force direct to PSI:

http://www.translatorscafe.com/cafe...-per-square-centimeter-[N/cm^2]-to-psi-[psi]/

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Also, what units do you want the final pressure to be in? PSI? If so, you'll need to convert the weight into pounds(force), and also convert from cm into inches.

I will state what will be obvious to others, since it seems you are not quite grasping this yet: You must use

- #13

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The final pressure needs to be in PSI.

So far is this correct. 10 grams = 0.098 Newton’s. Mat size is 12” x 12” = 144 square inches. Can you help me fill in the rest please?

- #14

Cyosis

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This is correct. Now you need to convert 144 in^2 to square meters. Then you divide 0.098 by square meters and then you use the Pascal to PSI conversion.avoinvents said:So far is this correct. 10 grams = 0.098 Newton’s

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Okay, that's the problem. The force here is 10 grams-force,OK, with the online converter, I selected from 10 grams – forces /centimeter ^2 ...

See Cyosis's recent post. You can chooseThe final pressure needs to be in PSI.

So far is this correct. 10 grams = 0.098 Newton’s. Mat size is 12” x 12” = 144 square inches. Can you help me fill in the rest please?

Note, we haven't explicitly done the complete conversion for you because this is a homework problem, and we think you'll learn this better if you can work the details out.

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Is this the correct answer?

0.000152995 psi

Please say it is.

thanks again

0.000152995 psi

Please say it is.

thanks again

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Looks good!

- #18

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Than you for all your help

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