The length of mercury thread in the uniform tube above the bulb of a mercury thermometer are :
30mm when the bulb is in melting ice; 180mm when the bulb is in the steam above boiling water ;
12mm when the bulb is a liquid.
What is the temerature of the liquid
A:-8
B:-12
C:6.7
D:8
Why the ans is B
I find the ans is A
My theacher said we can used 12mm to do
we have to do by 18mm
I don't why
