Tagged: The screwdrivers

March 9, 2015

The electric conductivity of substances and life application on it

The electric conductivity The substances can be classified according to the electric conductivity into good conductors of electricity and bad conductors of electricity, The electrical conductivity is the ability of a material to carry...

The Matter

March 7, 2015

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...