The molecule The matter is composed of small building units called the molecules which are composed of tiny structural units called the atoms, and it is anything that has a mass and occupies space, The...
Each substance has its density, The density is a physical property of the matter as each element and compound has its density, and it varies with the temperature and the pressure.
All metals are good conductors of heat and they are different in conducting the heat, which means that some metals conduct the heat faster than the other, The heat makes us comfortable and helps...
The reproduction process The reproduction process is a process that aims to secure the existence and continuity of living organisms species and to prevent them from the extinction, The human reproduce sexually when two...
