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).
The equivalent to 98.6 degrees Fahrenheit is 37 degrees Celsius. This is the average normal human body temperature, which is slightly lower in adults. The range is 36.8 degrees plus or minus 0.7 degrees. Normal temperature range will vary, sometimes considerably, for individuals. Normal human body temperature is traditionally defined as 37Â°C, or 98.6Â° Fahrenheit. Average: 37 (degrees) Celsius, but it can vary a little bit, of course. The normal body temperature in Celsius is 37 degrees.