What does the word convection mean in science terms?

Answer 1

Most substances expand as they get hotter. When a gas or a liquid expands within an environment of denser and cooler gas or liquid, it will rise. What often happens to the rising material is that at some point it cools off and returns downward, so a circular current is formed, rising and falling. That is called a convection current. Convection can be defined as a heat driven motion of a fluid.

Answer 2

In science, convection refers to the process of heat transfer through the movement of a fluid (liquid or gas). As the fluid is heated, its particles become less dense and rise, while cooler, denser particles sink. This movement creates a cycle of circulation that transfers heat throughout the fluid.