as that this temprature dT/dt=0. That is unless k=0, which means that
the system is perfectly insulated from its environment (assumed to be at
The higher k the greater the rate of loss of temprature, the lower k the
lower the rate of loss of temprature, and the rate of heat loss is proportional
to the rate of change of temprature.
So small k - good insulation, high k - poor insulation