This animation illustrates the physical principle behind the operation
of a calorimeter. On the right is an absorber with a thermometer
to measure its temperature. On the left is a heat sink. The absorber
and heat sink are joined by a thermal link.
The animation shows an X-ray hitting the absorber. As the X-ray
enters the absorber, the mercury in the thermometer rises, indicating
that a rise in temperature of the absorber. The heat from the
absorber is transferred to the heat sink via the thermal link. As
this happens the mercury in the thermometer decreases, indicating
that the absorber is cooling.