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By admin, April 13, 2011 9:32 pm

how to measure if a tissue is dry, with which to play?

science project topic, what fabric dries faster? Collected five fabrics the plan to absorb each one in a container of water and hang to dry and see that one dry first. However, to check whether the material is dry to the touch is not acceptable. How can we measure the dryness of a scientific way, without touching the fabric?

There are a couple of problems you have. First you have to define "dry." When a person touches a cloth, is a personal feeling that you say it is "dry." One person's dry is another dry. The second problem is that fabrics as cotton retains water even after the "dry." I think the best is to use a constant weight as an indicator of the "dry." Dry each fabric in the dryer or on a clothesline and then let them sit out for 24 hours in which they will regret. This balance is very important. Cut the sample sizes can weight easily, but not too light in weight. A 12 "x12" or 6 "x6" sample should work. You must make all duplicate samples or triplicate. You should also make a sample of each fabric that never wet as controls. Then wet and set aside. At this point take a decision. If you're going to squeeze the fabric. It will make a difference in some cases. Of course, pulled out a cloth dryer is faster and fabric construction make a difference. Then at a regular time interval, reweigh each fabric. You may have to do the whole thing a few times to figure this timeout interval and the tissue becomes drier, the interval should be shorter. I would start with 2-4 hours to start. When the material reaches less than 1% of original weight (maybe 5%) can call dry. If you use 5% if less than 1% over time. Once again, have two samples so you can play a game to see how it feels dry. What real samples should be taken to the point that it weighs the same as they did before the wet, but that may not occur for many reasons. You can also call a fabric "dry" when the weight does not change again. For example, if a fabric weighs 50 g in 1 hour and then 51 in 2 hours and 50 at 3 pm and dry in 1 hour.

Art of Crochet by Teresa – Crochet Tip 3: How to Extend Plastic or Fabric Projects