The hardness of materials and life applications on it
Hardness of materials Some solid substances are soft at room temperature such as the rubber, and some solid substances need heat to become soft and easy to be shaped such as the metals, and...
Hardness of materials Some solid substances are soft at room temperature such as the rubber, and some solid substances need heat to become soft and easy to be shaped such as the metals, and...
The boiling point is the temperature at which a matter begins to change from a liquid state to a gaseous state, The change of matter from the liquid state to the gaseous state is...
Matter exists in three states which are solid, liquid, and gas, and the matter can change from one state to another by heating, The change of matter from the solid state to the liquid...
The movement of electrons The electrons are negatively (- ve) charged particles, They revolve around the nucleus with very high speed, The electron has a negligible mass relative to that of the proton or...