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...
Category: The Matter
The boiling point and separation of the petroleum oil
The boiling point 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...
What is the melting point? & Life applications on the melting process
The melting point The 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...
The movement of electrons around the nucleus and the energy levels
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...
