Convex refers to a curvature that extends outwards, whereas non-convex refers to a curvature that extends inward. Non-convex is also referred to as concave.

A nuclear bomb means a bomb that performs a nuclear reaction; and an atomic bomb is a nuclear weapon that uses the energetic output of nuclear fission to produce massive explosions.

Machines consume energy produced by the engines.

Mechanically, equipments are required to design the machines. A machine is a tool, which is used to operate any task, whereas equipment is a set of tools necessary for a particular purpose.

Concave is used to describe an entity having an outline that curves inwards. On the other hand, convex is used to describe an entity having an outline or surface that bulges out. The terms are used as...