Hello,I am trying to construct an insulator that resists thermal change for a science projectOne of the notable prerequisite is that materials are limited to wood, paper, cardboard, natural fibers, organic granular material, and aluminum foilI was thinking of building a closed wood box, surrounding the inner parts with cork and filling it with goose featherCan anyone suggest better alternatives? The current thermal resistance is -14 degrees Celsius in 30 minutes after starting from 60 degrees.
You're on the right track for sureI bet they won't let you use goose down though, as it's not strictly a fiberThe aluminum foil is so you can put a reflecting layer(s) that will resist radiational heating/coolingCorrugated cardboard could be very useful as it can sequester layers of air and keep them from passing heat by convectionFluffy cellulosic stuff is blown into cavities in houses for insulationIf they let you use it, an insulating company would likely give you a bagful for your project if you asked nicelyLoose wool could be greatWhatever you do I'd try to get a layer of aluminum facing the cavity and facing the outside world, preferably with standoffs of some sort so things don't touch itThinking like a sea lawyer - the best insulation you can get is two silvered layers with a vacuum in betweenWe call that a Dewar flask or a Thermos bottleIf you could seal up a stout wooden box, line it with foil and pump the air out you could argue that nothing is not a material; and it might insulate extremely wellVacuum gets rid of the problem of convective transport in air as well as having no conductionProbably not practical, but I'd love to see the look on the teacher's face.
i think you might be overestimating the knowledge of the yahoo answers crowd ;)
BCalculation of yarn count 1.Worsted count (it belongs to staple fiber) Constant weight system,using metric count system when 1 gram of yarn runs 1 meter in length, we call 1's yarn 2 meters2's 3 3's 2.Denier count(it belongs to long fiber in other word, fillamentConstant length system If 9000 meters of yarn weigh 1gram,we call it 1d fillament 2grams 2d 3 3d 3.How to convert from one system to other sytem of yarn count Based on metric count, 1's Nm count 1.7 x 1's Ec count 9000/denier count(d) lea x 0.6
