I don't need to boil it but I need the highest difference in temperature in 20 minutesWhat material should I use? Any ideas?
A parabolic mirror with the water glass suspended at the focal point, all of which points at the sunAn equal capacity convex lens would weigh in at many many poundsThe mirror is the easiest to make and weighs the least for its ability to focus the rays from the sun into a pointPaper mache would work quite well to make a parabolic form, lined with aiuminum foil, shiny side out, of courseEver seen a satellite dish for something like dishtv on the side of a house? Take the receiver off the rod, line the dish with aluminum foil, shiny side out, and put the glass at the end of the rod at the focal point where the receiver wasThe thing about the dishtv shape is the focal point is off center so the object at the focal point does not cast a shadow on the reflectorCasting a shadow reduces the amount of light that is capturedMythbusters on The Discovery Channel did a show on the burning ray of Archimedes in which several people holding mirrors all focused light on a single spot so see if the myth was true that Archimedes came up with a way to set ships on fire at a distanceIt seems it might have been feasible for several hundred soldiers on shore holding polished bronze mirrors actually COULD have collectively focused enough sunlight on a ship at a distance to maybe start a fireI like the paper mache form lined with shiny sided aluminum foil because it would be very light and could support itself and be quite largeThe larger the reflector, the more light gathered, the hotter it gets in any given period of time.
Plain old ones are not, but if made with the right ingrediants they could be.
you would probably have to make them with whole wheat flourBut even then i dont think there would be much fibreTry eating breads made of whole grain or 8 grainsOatmeal is good too, make chocolate chip oatmeal muffins or cookies if your not a big fan of fibre cereals.
if they are made with whole wheat flour
