Use the equation for volumetric expansion for solids and liquids:
Where:
: change in volume = ?
: temperature coefficient of volumetric expansion = 
: original volume = 
: change in temperature: We will use a change in temperature of one degree Centigrade (equal to one Kelvin) to find how much the volume of the Hg will change.
I will convert the volume from centimeters cubed to millimeters cubed:
Now we plug everything in the equation:
The only place the Hg can expand or contract is in the tube itself. The volume of a cylinder of radius 'r' is the area of the circle times its height:
Centrigrade marks should be made every 2mm on the tube.