What is the rate of reaction? The time it takes for a reaction to occur.

How much energy is needed for a reaction to occur.

Collision Theory

The energy required to break a bond.

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)