## Orange Juice vs. Sports drinks

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### Orange Juice vs. Sports drinks

When performing this test does one absolutly have to use the conductance sensor? One could not just connect one cable from the multimeter to the 9 volt battery to the liquid and then have the other wire go directly to the liquid? I am afraid that not having it will mess up the formula I'm suppose to use at the end...Is that true? Please help soon i want to finish this project by the end of the week! Thanks so much!

P.S.
At the end of the experiment you are suppose to use the formula of cunductance= current divided by voltage. I understand the formula, but before that you are suppose to divide your answer by 1,000,000 from microamps to amps or divide by 1,000 from milliamps to amps. But when you type that into the calculator it doesn't work or comes up with a compilcated answer. Do you know what to do about this?

For example if orange juice is 0.7 microamps and then you divide that by 1,000,000 the calculator gives an answer of:
7E -7. What does that mean? How do I solve that or can I?

Last edited by PeaceLoveSmile on Tue Dec 29, 2009 5:36 pm, edited 1 time in total.
PeaceLoveSmile

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Project Question: orange juice vs. sports drinks
Project Due Date: January 1, 2010
Project Status: I am conducting my research

### Re: Orange Juice vs. Sports drinks

Hi,

I've moved your topic to the physical sciences forum, where I think you will get more help. Good luck!
MelissaB
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### Re: Orange Juice vs. Sports drinks

PeaceLoveSmile - As I understand what you are doing, you are measuring the conductance (the reciprocal of resistance, that is, G=1/R) of the different fluids, orange juice and sports drinks using a milliameter and a 9 volt battery. Both types of liquids will conduct current - orange juice because of the ionic nature of the citric acid in water, and commercial sports drinks because of their inherent 'electrolyte' qualities based on their contents of mineral salts, carbohydrates and other chemical compounds. I don't know what the hypothesis of your project is, so I'm not sure how this will correlate into your experiment.

The issue of translating units is somewhat simpler. The basic equation for resistance is R=E/I, where the unit of resistance, R, is an Ohm, E is a Volt and I is an Ampere. For conductance, the formula is inverse, G=I/E, where G, the unit of conductance, is the Mho (Ohm backwards), or now known as the Siemen, R is the resistance in Ohms. To translate your readings from microamps to amperes, divide by 1,000,000. To translate milliamps to amperes, divide by 1,000. Your calculator is using 'scientific notation' and is expressing 0.7 microamperes divided by 1,000,000 to be 7x10 to the -7th power, or .0000007 amperes. If you haven't studied scientific notation, just use the old math with all the zeros and decimal point. Hope this helps.

Rick Marz
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### Re: Orange Juice vs. Sports drinks

Rick,
Thank you very much for your help... My hypothesis for this experiment is that orange juice will have a higher conductance and therefore higher level of electrolytes. I now have come across another question... but I'm not sure if you'll be able to answer.
With this project you have to use a mulimeter. Today I was performing the experiment and i was moving from on test subject to another and all the sudden it stopped working. I changed the battery and wires. I reconnected everything and it still wouldn't read. It had worked for about 15 trials. My dad, an electrician, has looked it over and over. He said the wring is right and the meter is working. Do you know what the problem is? Thanks again.
PeaceLoveSmile

Posts: 5
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Project Question: orange juice vs. sports drinks
Project Due Date: January 1, 2010
Project Status: I am conducting my research

### Re: Orange Juice vs. Sports drinks

Rick Marz
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### Re: Orange Juice vs. Sports drinks

Thank you very much for your help I got it all fixed up and running smoothly.

Thanks Again
PeaceLoveSmile

Posts: 5
Joined: Mon Dec 28, 2009 4:42 pm
Occupation: student
Project Question: orange juice vs. sports drinks
Project Due Date: January 1, 2010
Project Status: I am conducting my research

### Re: Orange Juice vs. Sports drinks

Hi,

I wanted to conduct an experiment similar to this, so am I allowed to do this topic, or am I not allowed to since its already done?
0001065420

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Joined: Wed Sep 25, 2013 9:27 am
Project Question: Electrolyte chanllenge: Sports juice v.s. orange juice
Project Due Date: Sometime in December
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### Re: Orange Juice vs. Sports drinks

Hi 0001065420,

As long as your teacher is OK with it, I think you can definitely do this experiment. It's quite common for the same type of experiment to be done by different students--especially when you consider the huge number of students doing science fair projects in the United States and around the world. If you decide to do a similar project and have questions you would like the Experts to answer, please start a new topic. Doing so will help ensure your questions are answered in a timely fashion.
All the best,
Terik
Terik Daly
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