It means that it is estimated that the error in a measurement or calculation is not much more than 1 degree Celsius.
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To convert a temperature given in Celsius to the same temperature in Fahrenheit degrees: -- multiply 'C' by 1.8 -- add 32 to the answer. 98.6 Celsius = (98.6 times 1.8) plus 32 = 177.48 + 32 = 209.48 Fahrenheit
15 degrees C
13 Celsius degrees - NOT to be confused with 13 degrees Celsius.
degree 1
multiple means multiple, plus means plus.