Sustainable energy, specifically renewable energy or green energy, is an energy source which can be replenished, that is essentially inexhaustible. Sustainable sources...
STRUCTURE OF MATTER
State of matter is defined in terms of the phase transitions which indicate the change in structure and properties. Solids, liquids and...
Thermionic emission is the discharge of electrons from heated materials, widelyused as a source of electrons in conventional electron tubes (e.g.,television picture...
