Which of these is a conversion from chemical energy to mechanical energy?

A. A dark light bulb starting to glow

B. A ball rolling down a hill

C. A person lifting a weight

D. A potato being heated in an oven

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)