Carbon-12 and Carbon-14 are elements that are isotopes of each other. What do Carbon-12 and Carbon-14 have in common

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)