A thermometer has its term marked millimeter instead of degree celcuis .The lower fixed point is 30mm and upper fixed point is 18mm. Calculate degree celcuis when the thermometer records 45mm

-125 degree celcuis

Explanation:

Using the formula;

θ - 0/100 - 0 = 45 - 30/18 - 30

Let us recall that the right hand side refers to the temperature in degrees centigrade while the right hand side stands for the temperatures in the scale of the thermometer. In both cases, the denominator is the fundamental interval.

So, we have;

θ/100 = 15/(-12)

-12θ = 1500

θ = 1500/(-12)

θ = -125 degree celcuis

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