THE WEATHER
'(<a href="http://www.j-archive.com/media/2010-12-17_DJ_08.jpg" target="_blank">Jimmy of the Clue Crew explains a weather map.</a>) On a weather map, an isobar is a line that connects areas with the same barometric pressure.  A line that connects areas with the same <a href="http://www.j-archive.com/media/2010-12-17_DJ_08a.jpg" target="_blank">temperature</a> is called this'
an isotherm