It isn't. It will be written on the x-axis if it is the independent variable, but there are also situations in which you want to know the temperature as a function of something else; i.e., the temperature is the dependent variable.
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.... then your graph is inverted.
Which point is not located on the xaxis or the yaxis of a coordinate grid?Read more:Which_point_is_not_located_on_the_xaxis_or_the_yaxis_of_a_coordinate_grid
It is called the ordinate.