What is a simple experiment to determine the permeability of cheesecloth, plastic wrap, latex rubber, and satin and linen cloth,wthe the materials of two beakers, 2 liters of water, a stop watch, a rubber band, and a 15-cm ^2 piece of each material to be tested.
138686
Place a single layer of one piece of material at a time over the top of an empty beaker and secure it using a rubber band. The material should not be pulled too tightly. Start pouring water from the other beaker into the first through the layer of material as quickly as possibly but without spilling any water. Use the stopwatch to see how long it takes to transfer equal amounts of water. Relative permeability will be inversely proportional to the times. Water will not permeate latex rubber, if you try pouring it it will simply pool, giving infinite time and zero permeability. Pouring through the clothes the water will pool a little but still pass through, giving shorter times and higher permeabilities.
632834
make sure you know the material you are being tested on
320707
that depends upon wheather you are going to design experiments for bulk product aspirin or formulations like aspirin tablets.\nfor bulk products tests like melting point, assay(percentage purity), solubility testing .... etc,.\nif that is a tablet you have to proceed with release rate, tablet weight, frightness test,etc.....
410622
Which brand of paper towel is most absorbent?  Buy some different brands of paper towel, make each sheet the same size, and submerge each of the towels (one at a time) in a glass containing 1 cup of water, for 30 seconds.  lift the towel out after the time limit, and collect any water that runs off of the towel for 10 seconds, then using a measuring cup, or a beaker, see how much water was not absorbed. (what is left in the glass, and what ran off during the 10 second drain period)  Get 4-5 brands of paper towels, and do 3 trials for each brand.\n\nSupplies: \n     1 roll of paper towel/brand\n     1 glass\n     1 beaker, graduated cylinder, or measuring cup\n     water\n\nThis is good for projects up to about 7th or 8th grade, grades 9-12 usually look for something better.
159306
I think it depends on how the fibers in the clothes react to being placed in water. Natural fibers like cotton and wool absorb large amounts of water. The other thing would be what happens to the fiber when it dries (especially with heat). Not all fibers absorb water, nylon, polyester and lycra don't absorb much water. \n\nOne thing you could do for your project would be to take the same amount of some of these fibers in different containers and then pour in a certain amount of water. Then measure the amount of water that you can empty off. That will tell you how much water is absorbed.
503632
L = μ(0) μ(r) N^2 A/l\n\nwhere\n \nμ(0) is the permeability of free space (4π × 10-7 henrys per metre) \nμ(r) is the relative permeability of the core (dimensionless) \nN is the number of turns. \nA is the cross sectional area of the coil in square metres. \nl is the length of the coil in metres\n\nHere we assume that μ(r) = 1, since the solenoid doesn't enclose anything like a metal core. Then\n\nL = [μ(0) N^2 (πR^2)] / l, where R is the radius of the solenoid\n\n= [(4π × 10-^7)(2920)^2(π(0.005)^2)] / (0.1)\n\n= 8.44 × 10-^3 henries
37585
compressing 2 liters of water into a 1 liter volume\n\nLiquids are not compressible.
28734
A classic, but great visual experiment is sucking a hard boiled egg into an erlenmyer flask.  It is done by using the principles of the kinetic theory of matter.  \nAnother cool project might be doing something with dry ice.  Find a place that you can get dry ice and do fun stuff with it, like create smoke, put bubble solution in water and then drop in dry ice to make bubbles that, when you pop, let out white smoke.\n\nAnother idea might be to do some cool colorful reactions.  Make some dye molecules or something.\n\nHope one of these ideas works for you.
207400
Patch clamp experiments measure flux through an ion channel. A tiny piece of cell membrane containing the channels of interest is held in a solution at the tip of a pipet connected to a probe that meaures the concentration of ions in the pipet compared to the solution. You can look at how drugs and volatge and things like that affect the opening of ion channels.
240042
you can measure the volume if you are very quick.\n\ntake a scaled glass, preferably one used in labs with a scale in mm3 or cm3, pour some water in it and read on the scale the volume of water.\nThen put the pretzel in the water and quickly read again the scale. \nThe volume of the pretzel is the difference between the second reading and the first one.\nDo it fast because the pretzel may absorb water. Or paint the pretzel with nail polish to be waterproof! :-)\n\nThe surface area is more difficult, but you can use a millimeter paper to have an approximate value. Put the pretzel on it, and draw around carefully the shape. Then count how many little squares are inside the contour lines, and multiply it with the area of one little square (= 1 mm2) :-)))\n\nHave fun!!!
210338
did you also prepare a standard solution? because the way i do it, is that i have a standard so i can compare the 2 absorbtions (same wavelength)...You know the equation..
21461
a multimeter, junior! do your own homework!
28610
This sounds so excessive! What a crazy teacher you must have. :)\n\nAlright - well...\nThe gravel is the easy part. Use the screen as a sift and hopefully the screen will be fine enough that none of the gravel will get through. \n\nNow the plan of action is dump the powder and salt in the water. [Which I guess will be done in Cup #1.] You'll filter out the powder. The salt will dissolve in the water, and you will evaporate the water later. The question is how to do this with what you have.\n\nI'm thinking the craft sticks are to hold up the funnel. Arrange them over the top of the cup [Cup #2] so that they make a triangle and see if it'll hold up the funnel. \n\nPut a filter paper in the funnel. Pour the mixture in and the powder will collect in the funnel. When you're done, take out that first filter paper and set it aside. Then set up your funnel in Cup #3 with the second piece of paper and filter the mixture a second time just to make sure you got all of the powder.\n\nI was trying to think of what the syringe could possibly be for, and the only thing I can think of is to take the salt-water out of Cup #3 and into the evaporation dishes.\n\nNo idea what the magnifying glass is for.\n\nBut the basic idea is that you sift out the gravel, mix the powder&salt in water, fliter out the powder, then dissolve the water.
621912
Experiment life is short.
480547
Use three test tubes, put equal amout of enzymes in all and put the substance they digest in both (equal amounts of course).\n\ntake a test tube(A) and put 2cm3 of Hydrochloric acid.\nTake test tube (B) and put 2cm3 of Pure water(pH7).\nTake test tube (C) and put 2cm3 of Sodium Hydroxide.\n\nshake them all a little just as you start the test.\n\nLeave them for half an hour at their optimum temperature and other factors.Make sure all factors among them are equal.\n\nAfter that, Test for the substance you put in (e.g test for starch using iodine if you put starch in).\n\nThe one with the most negative result is the optimum pH.
644036
There's an SAT subject test in chemistry.
131637
borax or alum\n\nmaybe salt\n\ntry copper sulfate