Scioly.org

haven chuck wrote:

SolonSOohio wrote:I have some questions:
How do you tell if a powder is hygroscopic? (procedures)
How do you test conductivity if you aren't allowed to bring a multimeter? (tester used)

A) Look in the 2007 test packet (2006 tests). There is an excellent description of the experiment that they were looking for testing for hygroscopic-ness on the CJAP test answer key.
B) Why wouldn't you be allowed to bring a multimeter? It says in the rules that a conductivity tester is allowed?

I asked the FAQ on national science olympiad page and they said you can't bring a multimeter. See here: http://soinc.org/node/477
Also what is the link to the "2007 test packet (2006 tests)".

There's a difference between a conductivity meter and a multimeter. It's like the difference between resistance and resistivity (I'm in shock value). Basically though, you need to either make a conductivity meter, or you can buy one of those fancy digital ones.

ichaelm wrote:There's a difference between a conductivity meter and a multimeter. It's like the difference between resistance and resistivity (I'm in shock value). Basically though, you need to either make a conductivity meter, or you can buy one of those fancy digital ones.

Yes, but it said you couldn't bring a multimeter for measuring resistance. What should i bring then?

You can make one out of a battery, a LED, a small incandescent lamp, and two pieces of metal. The LED will be highly sensitive, the lamp will be less sensitive (they should be in parallel). Or, I can trade you one at the swap meet!

Would this be ok? - http://www.amazon.com/RCI-Conductivity- ... B0017Y7K6K

Oh sure! But the shipping is gonna be a killing... Lol seriously, if you anyone needs one I can make a simple one in 5 seconds and give it to you friday! Or ask your shock value guy! If he can't do it then he needs to practice more

Edit: Wait a minute. That's like 50 dollars. Without shipping. That's completely unreasonable. If you do buy one, don't fall for something like that!

We already had it and used it for states, but I wanted to make sure I wasn't missing something and was going to bring a DQ upon myself. Thanks for the offer though.

Oh ok then

I know they let some of you use a graduated cylinder at States, but will they allow it at Nationals?

I'm preety sure you can because how else would you measure the volume of the liquid? It depends on the national judges.