A piece of aluminium has a mass of 200 kg and a volume of 0.074 m 3. Calculate its density in kg/m 3, to two significant figures. The kilogram (kg) is the standard unit for mass. The cubic metre ...

Earth has a magnetic field because there’s molten iron in its core. As the liquid metal moves and flows, it makes a giant ...

Fusion energy is being researched and developed as a new source of electric power that will contribute to the realization of ...