[paradoxed00]

When converting a temperature what are the rules that you are supposed to follow as far as decimal places and sig figs? I understand the concept that you can't increase accuracy in a calculation you can only take away from but I still am unsure on this and haven't found anything of notable use.

I.E.

9°c -> °f --- (1.8 · 9°c) = 16.2   16.2+32= 48.2°f

Now the problem I run into is that the answer now has a decimal and 3 sig figs, neither of which are in the original number of no decimals and 1 sig fig. Would I keep the 48.2 based on the fact that the multiplication of the 1.8 and addition of the 32 are known exact conversion numbers? or change the final number and round based on the original measured number only have 1 sig fig and no decimals?

[chenbeier]

Temperatur values with one digit behind the comma are common. 32 ° F = 32.0 ° F, The same for celsius. For Kelvin 2 digits normaly used. 273,15 K = 0,0 ° C
So a conversion from one unit to another should be no problem.

9° C = 9,0 ° C = 48,2° F