BruteForceRacer wrote:Does anyone know what the specific meaning of a brown bag test is? I keep hearing the name when I study but I can't find any information on it.
If i remember correctly, A brown bag test is simply seeing if a lipid leaves grease stains on a paper bag. http://www.seplessons.org/node/362 <-----it is in there some where!BruteForceRacer wrote:Does anyone know what the specific meaning of a brown bag test is? I keep hearing the name when I study but I can't find any information on it.
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At the regional comp I did first break, and that worked for me...sciolyperson wrote:Do you guys know if we graph the data for the finalbreak of the fluid or the first break in the line of fluid ?
It shouldn't matter as long as you test fluids consistently and use your standard curve.135scioly wrote:At the regional comp I did first break, and that worked for me...sciolyperson wrote:Do you guys know if we graph the data for the finalbreak of the fluid or the first break in the line of fluid ?
SaranghaeOh no! Do NOT do that!aehyunkim wrote:and we just decided to use one we found somewhere else.
There are many reasons why this is a bad idea.As previously mentioned, you should use a spreadsheet program, such as excel, to make a graph with a trend line ("line of best fit" - the closest smooth curve to your points). Some people seem not to understand how the graph is used. You measure all your fluids to create the graph, then when you are in competition, you time that fluid and you are comparing it to the others. The point is that viscosity has a correspondence with flow time, so the graph shows you that correspondence. You merely find the time on the graph and see what viscosity it is. However, we have had some difficulties with collecting the data, as many of the liquids only drip and never have a steady flow. This makes it difficult to gauge the time it takes to "break the flow". Does anyone have any suggestions about that?aehyunkim wrote:Hey guys, just wondering: How the HECK do we do the standard curve? My teammate and I already have the viscosity of the liquids and the time it takes to break (for 50 ml). I looked at the standard curve on the graph, and we just decided to use one we found somewhere else. I know, we should be using our own and I TOLD my teammate that already. Anyway, do you guys know exactly how to set it up?
I really hope you guys can help me! All help appreciated!!
We had the same dripping problem with our viscosity tester when we tried honey, and what we did (at least the only thing we could think of) was making the hole bigger so the liquid could flow easier. It worked, but it changed our times for the other liquids, though that didnt really matter. Also, make sure you poke the nail through your styrofoam cup from the inside, not the outside!Gemma W wrote:As previously mentioned, you should use a spreadsheet program, such as excel, to make a graph with a trend line ("line of best fit" - the closest smooth curve to your points). Some people seem not to understand how the graph is used. You measure all your fluids to create the graph, then when you are in competition, you time that fluid and you are comparing it to the others. The point is that viscosity has a correspondence with flow time, so the graph shows you that correspondence. You merely find the time on the graph and see what viscosity it is. However, we have had some difficulties with collecting the data, as many of the liquids only drip and never have a steady flow. This makes it difficult to gauge the time it takes to "break the flow". Does anyone have any suggestions about that?aehyunkim wrote:Hey guys, just wondering: How the HECK do we do the standard curve? My teammate and I already have the viscosity of the liquids and the time it takes to break (for 50 ml). I looked at the standard curve on the graph, and we just decided to use one we found somewhere else. I know, we should be using our own and I TOLD my teammate that already. Anyway, do you guys know exactly how to set it up?
I really hope you guys can help me! All help appreciated!!
