How hot is the heat from a magnifying glass?
611962
How hot is concentrated light, what is the temp of the sun?\n\nWELL WE HAVE A ENERGY SHORTAGE, ONLY AT SUNSET.\n\n I read about Solar collection in power plants like Solar One.  In these plants the where they make molten salt, for heat transfer for running steam generator. At the reciever of Solar One plant or concentrated light point temperature reachest approximately 1,050 Fahrenheit.\n    \n      THIS LINK IS ABOUT YOUR SUN AND THE TEMPS ARE HOT.\n         SO HOW MUCH LIGHT CAN WE CONDENTRATE MORE  \n           DEVELOPMENT IN SOLAR SAILS\n\nhttp://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html \n\n Earth's Sun is a medium-sized star which lies on the main sequence with 90% of the known stars. It has a effective surface temperature is 5780 K, putting it in spectral class G2. Its mass is 1.989 x 1030 kg and its mean radius is 6.96 x 108 meters. The mass of the sun is over 99.8% of the mass of the entire known solar system, leading de Pater and Lissauer to refer lightly to the solar system as "the Sun plus some debris". \n\nThe sun radiates energy at the rate of 3.85 x1026 watts. Just outside the earth's atmosphere solar energy is received, assuming normal incidence, at the rate of 1340 watts per square meter. \n \n\nThe orbit of Earth ranges from 1.47 to 1.52 x 1011 meters from the Sun. The average light travel time to the earth is 8.3 minutes. \n\nThe radius of the sun at 696,000 km is 109 times the Earth's radius. Its surface gravity is 274 m/s2 or 28.0 times that of the Earth. Its mean density is 1410 kg/m3 or 0.255 times the mean density of Earth. \n\nThe composition of the sun is 71% hydrogen, 27.1% helium and less than 2% of all other elements. \n\nThe center temperature is modeled to be 15.5 million K. The Sun is fueled by the proton cycle of nuclear fusion.\n\nEscape velocity = 618 km/s\n\nSO
170755
Specific heat 0.13 J/gK
81499
Depends on what you are burning.  I know you can get paper to 451 farenheit, because it will burn.  (You do know about Ray Bradbury's book, don't you?)  It would be interesting to know whether there are any limits, given that solar energy is really nuclear power.  Any science majors want to tackle the experiment?  Burn different materials with known flash points?
337103
Temperature measurement
531996
http://www.fundraisingknowhow.com/fundraiser-articles/thermometer.aspx
656604
You could focus sunlight from a bundle of light fibers using a lens and really burn things up.\n\nFocused sunlight can burn holes through steel plates.\n\nAny amount of sunlight falling on something will heat it.\n\nYou only need a simple thermometer to check it out.
45324
Hey this is an outstanding question because it really gets into the difference between temperature and heat and the power of the sun. All important stuff.\n\nThe answer is it depends on the time of day, the day   of the year, the diameter of the magnifying glass, and what you are heating!\n\nBooooring warning: The spot of light from even a small sized magnifier if reflected off white paper or a shiny surface can actually damage your vision. Be careful out there!\n\nSolar ovens can reach 400 F, enough to cook with.\n\nSolar forges can get up to temperatures which can melt metal.\n\nTemperature just measures how fast the molecules and atoms in stuff are jiggling or zooming around. \n\nHeat is a measure of energy, and for a particular piece of stuff, it is often related to temperature almost proportionally, like you double the temperature of a cup of coffee from 68 F to 136 F and the heat (energy) in the water roughly doubles too!\n\nThings can be wicked high temperature, but have very little heat. For instance at high altitudes the atmosphere is almost a vacuum and the molecules go whizzing around. The temperature is insanely high, but jet airplanes don't melt. Because there is so little matter.\n\nOr an object can have lots of heat but not burn you. Check out the science demo in the sources about holding a glowing red space shuttle tile in your bare hand.
426622
temperature differences
470944
You're so hot.  It must be those strange purple sunglasses you randomly have. *humps computer screen*
493713
See it through a magifying glass. it will look 'BIGGER'
759217
Burn it in a sprectrophotometer.  Look at the emitted light.
263946
Have each page work on the same princable as the bi-metallic thermometer.  Try to find two materials the expand differently than eachother because of heat, or you could use humidity to expand one material more than the other. You could probably find some material that contracts (or expands) when an electrical current passes through it. place a strip of this along the top and bottom of each page. Thats all i can think of right now.\nCool question by the way.
800137
Stained glass makers use 60/40 solder, which means 60% tin and 40% lead, has a lower melting point so it doesn’t require as much heat. \n\n--> http://www.delphiglass.com/soldering-items/solder/mastercraft-60-40-solder-1-lb.html
1165990
http://www.temperatures.com/apps/index.html
1137794
You are looking at a magnifying mirror ;)
478962
You can get a infrared thermometer. just point it at the flame and it will tell you the temperature. it will also show you the differences when you move to diff rent colors in the flame.. blue being hotter than the yellow.. i bought one on line for 39 dollars from eBay i think
1095598
For part 1, if the cell's diameter was 1/15 of the total field, and the field was 450 microns across, then the cell's actual diameter was 450 microns/15 = 30 microns = 3 * 10^-5 meters.\n\nThe diameter of this cell in the drawing is 0.5 cm = 5*10^-3 meters.  This drawing therefore has a magnification of (5*10^-3)/(3*10^-5) = 166.6666666...times.\n\nFor part 2, The magnification is given by (size in image)/(actual size), so we have that 45000 = (1.5 mm)/a, where "a" is the actual thickness.  Solving for a, we get a = 1.5mm/45000 = 3.333*10^-8 meters = 33.3 nanometers = 0.0333 microns.\n\n-----------------------\n\nAs for the question posed in the "additional details", when the magnification of a microscope is increased, the diameter of the field being imaged decreases (choice "A").