what tempature can you reach with a magnifying glass?
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?
428486
go to your yahoo or other search engine and type in global tempratures,you will get quite a few results.\n\nGOOD LUCK!
584100
look at it through a magnifying glass!
831180
to test reading glasses
115564
the temperature ranges from aprox. 50 kelvin to 53 kelvin.\nThat on the centigrate scale is -223 C to -220 C.
911974
Go with a line graph, that way you can also find out (or estimate) temperatures at times when you didnt measure it.
177736
Here is what I have found:\nGamma Rays - 124 pm (pico-meter) and up\nX Rays - 10 to .1 nanometers
25444
You could try to make an accurate experimental thermometer by glueing two strips of dissimilar metals together along their lengths. Perhaps try copper and steel or copper and aluminum or steel and aluminum.  Try perhaps one half inch wide by six inch long strips.  Use sheets of metal that are equally thin.  Perhaps cut the strips from aluminum soda cans and steel soup cans, etc.  Use a magnet to check for steel vs aluminum.  Glue the strips together using epoxy or super glue.  Attach one end of the combined strip to a firm base and leave one end free to move in front of a paper scale.  You now have a bimetalic thermometer.  The thermometer can be made to be more sensitive by using greater length strips and bending the strips into a spiral and attaching a pointer to the free end of the spiral to amplify movement.  This is how most oven thermometers are built except the metals are joined without glue.  The principal of operation of a bimetalic thermometer is that one  metal expands or contracts more or less than another metal.  When joined, a temperature change causes the combined strip to bend.  You can calibrate your thermometer by marking its "pointer" position at two or more large temperature changes then calculating the total deflection divided by the total temperature difference to get deflection per degree (either F or C).  Be careful with tin snips and epoxy or super glue.  Good luck.\n\nAs an alternative, you can make a highly accurate experimental thermometer by winding very thin insulated copper wire (like that used in toy motors) around a wooden spool and connecting the scraped   wire ends to an accurate ohmmeter to measure resistance change vs temperature change.  Calibrate as before but remember that calibration temperatures must be steady long enough for any lag to catch up.  This is called a resitance thermometer and accuracy will depend on the length and thinness of wire and sensitivity of your ohmmeter.  Also the ohmmeter should not cause enough current to flow in the wire to heat the wire.  Observe for drift (increase in resistance and temperature) while taking measurements.
10501
From Fahrenheit = (value - 32) / 1.80\n\nor use http://www.csun.edu/~jmj2600/hw4.html
763890
You asked this question twice, and I posted a detailed solution in answer to your other question.  I know your teacher's answer is 49 degrees, but if you go to the nearest tenth of a degree, 48.9 is a better answer.
278524
Celsius or Centigrade
1107510
-40 F or -40 C is a good estimate
218959
Gauge blocks usually are not subjected to any variation in temperature within a 30 deg. F. room temperature variation. There  are expansion rate considerations for machining steel, but any temperature 30 deg. F. beyond 68.8 deg. would make the Gauge block tenths of thousands of an inch off, but usable in most measurement situations.
445723
somewhere around room temp\n\nin a freezer
488914
Wear magnifying lenses.
1163379
View it through a magnifying glass- thats quickest
540459
something close to zero