# EVERYDAY SCIENCE

## SCIENCE

### PHYSICAL SCIENCES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Convection currents rise in air because
 A hot air rises and cold air remains stagnant B cool air descends and hot air rises C the molecules in hot air move faster D hot air has less friction
Explanation:

Detailed explanation-1: -Convection. The rising of warm air is how heat (or energy) is transferred throughout our atmosphere. This process is called convection, and the rising of warm air and sinking of cold air is called a convection current. These convection currents can also be seen in a liquid, like a pot of boiling water on your stove.

Detailed explanation-2: -When the molecules are heated, they move faster and move apart, causing them to be less dense and rise. When the warm air rises and the cool air sinks, convection currents are created.

Detailed explanation-3: -How does convection work? Convection works by areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.

Detailed explanation-4: -In convection currents, heat is transferred upwards.

Detailed explanation-5: -Conduction involves molecules transferring kinetic energy to one another through collisions. Convection occurs when hot air rises, allowing cooler air to come in and be heated. Thermal radiation happens when accelerated charged particles release electromagnetic radiation, which can be felt as heat.

There is 1 question to complete.