A two year old is twice as old as a one year old. They are only one year apart. My mother is twice as old as I am (50 to my 25), she is 25 years older than I am. Does the fact that there are different lengths between the numbers on our respective line graphs negate the multiplication involved? Multiplication takes a number and adds that number to itself the specified number of times (3 X 4 = 3 + 3 + 3 + 3). So 80 degrees is 40 x 2 = 40 + 40, and 0 degrees is 40 - 40 = 40 x 0. Yo.
Ahhh, I see, the question refers to the fact that temperature is a measurement of the energy in a system. It has a definate zero (at which things are at total rest), this is called absolute zero
and is about -450 degrees Farenheit. So, 450 degrees Farenheit is twice as "hot" as 0 degrees Farenheit (which doesn't make much mathematical sense sinse 0 x anything = 0). The point of reference is moved in the Farenheit system, zero is not technically zero. Now if we used Kelvin (the scientific unit of temp.) the math would apply again, because 0 Kelvin is absolute zero. So 80 degrees Kelvin is twice as "hot" as 40 degrees Kelvin.