Whether you’ve got a wrist sprain a stomachache or a disease that is chronic, one of the things nurses and doctors will do in a consultation will be take your temperature. A temperature that is standard means your body is humming across. A temperature means you demonstrates that your body could be fighting with an illness, and have a fever.
And since 1871, “normal” has meant 98.6°F (37°C). That amount was determined by a doctor, based on countless readings by sticking thermometers taken. When physicians in the U.S. and Europe replicated the experiment in local populations, they developed the identical number, so it stuck.