Question

In convectional currents,

• A. Warmer molecules move up and colder molecules sink down.
• B. Heat energy moves up by infrared waves.
• C. There is no motion of molecules.
• D. It is dominant in solids

Answer 1

The correct option is A Warmer molecules move up and colder molecules sink down.

During convection, warmer molecules move upwards and colder molecules move down due to the difference in density.Convection, occurs due to temperature differences which affect the density, and thus relative buoyancy, of the fluid. Heavier (more dense) components will fall, while lighter (less dense) components rise, leading to bulk fluid movement.