The method of controlled pulse heating of a wire probe in good contact with
a liquid has been developed for estimation of the thermophysical propertie
s in the region of instability of this liquid with respect to the temperatu
re and the heat flux. It ensures rapid penetration into the region of short
-lived states and maintenance of a given temperature in this region. This p
aper presents and discusses the character of variations of the values of th
e thermal activity and the lifetime of a system, before its disintegration,
for thermally unstable liquids, such as polymeric and microheterogeneous s
ystems, for different heating paths.