verb. The definition of a chronicle is a record of things that have happened in the order which they happened. A US history book is an example of a chronicle. Chronicle means to gather facts and information about events which have happened.
A microwave oven is a type of oven that uses microwaves to heat up food. Microwaves are a type of electromagnetic wave that is sandwiched between radio wave and infrared radiation on the electromagnetic spectrum and their frequencies range between 300 MHz (0.3 GHz) and 300 GHz.
How Microwave Ovens Work. The invention of the microwave is a fantastically simple concept. Microwaves have a frequency that can penetrated water, fat, and sugar molecules and excite them. For a molecule to be excited the electrons orbiting the nucleus have to jump up energy levels.