Once the temperature reaches 212 F (100 C), the temperature stays constant and all of the energy is used to change the water into steam.
(the temperature; reaches; 212 F) (the temperature; stays; constant; T:Once the temperature reaches 212 F) (the temperature; is used; to change the water into steam)
the temperature the temperature the temperature
reaches stays is used
212 F
constant T:Once the temperature reaches 212 F
to change the water into steam