EARTH SCIENCE
CLIMATE AND ENVIRONMENTAL CHANGE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The transfer of heat (energy) through rays or waves.
|
|
|
The transfer of heat between two molecules in direct contact.
|
|
|
The transfer of heat when hot molecules rise and colder molecules fall or sink.
|
|
|
None of the above
|
Detailed explanation-1: -Convection is the transfer of heat energy in a fluid. This type of heating is most commonly seen in the kitchen with a boiling liquid. Air in the atmosphere acts as a fluid. The sun’s radiation strikes the ground, thus warming the rocks.
Detailed explanation-2: -Convection. Convective heat transfer is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.
Detailed explanation-3: -Convection is defined as the circulation of fluids (liquids or gases), either natural or forced. Hot or cold fluids can add or remove heat. Natural convection is caused by density differences. Hot air rises because it is less dense than cold air, so air will rise above a heater and sink near a cold window.
Detailed explanation-4: -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.
Detailed explanation-5: -In convection, heat flows from the cold end to the hot end of the substance.