Infrared light was discovered in 1800 by Sir Frederick William Herschel. Herschel, born in Hanover, Germany, decided to investigate the temperature of each color of the spectrum produced when sunlight is passed through a prism.To do this, he used three thermometers whose bulbs he blacked out (the better to absorb heat with).erschel, born in Hanover, Germany, decided to investigate the temperature of each color of the spectrum produced when sunlight is passed through a prism. To do this, he used three thermometers whose bulbs he blacked out (the better to absorb heat with).
Body temperature may be abnormal due to fever (high temperature) or hypothermia (low temperature). A temperature over 38Â°C (100.4Â°F) most often means you have a fever caused by infection or illness. It is generally medically accepted that normal body temperature ranges between 36.5Â°C (97.7Â°F) to 37.5Â°C (99.5Â°F).
Most people think a normal body temperature is an oral temperature (by mouth) of 37Â°C (98.6Â°F) . This is an average of normal body temperatures. Your normal temperature may actually be 0.6Â°C (1Â°F) or more above or below this.Also, your normal temperature changes by as much as 0.6Â°C (1Â°F) during the day, depending on how active you are and the time of day. Body temperature is very sensitive to hormone levels.So a woman's temperature may be higher or lower when she is ovulating or having her menstrual period.our normal temperature may actually be 0.6Â°C (1Â°F) or more above or below this. Also, your normal temperature changes by as much as 0.6Â°C (1Â°F) during the day, depending on how active you are and the time of day. Body temperature is very sensitive to hormone levels.