explain the working principle of bimetallic strip thermometer
Bimetallic strip A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass. The strips are joined together throughout their length by riveting, brazing or welding. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled.
World's tallest thermometer The World's Tallest Thermometer is a landmark located in Baker, California, USA. It is an electric sign that commemorates the record 134 degrees Fahrenheit (57 degrees Celsius) recorded in nearby Death Valley on July 10, 1913.