When did Andres Celsius invent the Celsius thermometer?
Anders Celsius, a Swedish astronomer, created his temperature scale in 1742.
Swedish scientist Anders Celsius neither invented nor improved the thermometer. What he did, in 1742, was to propose a thermomenter scale with 100 divisions between water's boiling point and its freezing point. The scale developed by Celsius was actually the reverse of the scale we use today. He placed 0 at water's boiling point and 100 at its freezing point. So the Celsius temperature scale was not actually his "invention"; it is simply named in…
A medical thermometer only has a range of 35 to 42 celsius, as that is the only realistic temperature range that the human body will be in between. This is because, if anyone is below 35 celsius, or above 42 celsius, then they will be dead, or close to dying, and you don't need a thermometer to recognize either of these symptoms.