Which mechanism of heat transfer is involved in heat flow from Sun to Earth?

electromagnetic radiation
Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.

What happens when air heats through contact with a warm surface?

Convection happens in a liquid or a gas. Air near the ground is warmed by heat radiating from Earth’s surface. The warm air is less dense, so it rises.

How does the earth heat the air in the troposphere after it is warmed?

Greenhouse gases warm the atmosphere by trapping heat. Some of the heat radiation out from the ground is trapped by greenhouse gases in the troposphere.

How does heat flow through the outer core?

From the geothermal gradient it is also obvious that the outer core/mantle boundary is a big insulater. Since these two are separate heat transfer from the outer core to the mantle is also mainly by conduction. For the mantle it is a story of both convection and conduction.

How does heat travel from the sun to the clothes?

The radiation heats up the moisture and it becomes water vapour. This water vapour will either linger around the clothes, or it will slowly be transported away by natural convection currents, depending on the temperature of the surrounding air.

Why does hot air go upwards?

As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

What are two factors that affects conduction on the earth’s surface?

Thanks to physics, we know that conduction is affected by temperature difference, the area of conduction, the distance the heat must travel, and the amount of time that passes.

What process by which heat is directly transmitted through a substance?

what is convection? the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

How does the troposphere heat up?

The troposphere gets some of its heat directly from the Sun. Most, however, comes from Earth’s surface. The surface is heated by the Sun and radiates back into the air. This makes the temperature higher near the surface than at higher altitudes.

How is heat transferred throughout the troposphere?

The bulk of heat energy transferred in the troposphere is done by convection. Convection does not only mean thunderstorm clouds but means any mixing of air. Air is always on the move (rising, sinking and advecting). The air mixes as it moves into the surrounding air.

How does heat flow through the inner and outer core?

Scientists know that the outer core is liquid and the inner core is solid because: S-waves stop at the inner core. The strong magnetic field is caused by convection in the liquid outer core. Convection currents in the outer core are due to heat from the even hotter inner core.

How do cooling fins work?

The fin is exposed to a flowing fluid, which cools or heats it, with the high thermal conductivity allowing increased heat being conducted from the wall through the fin. The design of cooling fins is encountered in many situations and we thus examine heat transfer in a fin as a way of defining some criteria for design.

What is the direction of the heat flow in the fin?

There is heat flow of magnitude at the left-hand side and heat flow out of magnitude at the right hand side. There is also heat transfer around the perimeter on the top, bottom, and sides of the fin.

What factors affect the performance of the heat sink?

The direction of airflow also has an impact on the performance of the heat sink. Airflow in the direction parallel to fins is recommended because, in this arrangement, air moves along a longer distance through fins.

What are the applications of a heat fin?

Fins are used in a large number of applications to increase the heat transfer from surfaces. Typically, the fin material has a high thermal conductivity. The fin is exposed to a flowing fluid, which cools or heats it, with the high thermal conductivity allowing