Transfer of Energy Atmosphere.

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Presentation transcript:

Transfer of Energy Atmosphere

The Sun’s Energy Sun is the source of all energy Atmosphere defines how much energy you keep Other planetary options Mars is too cold because it has a thin atmosphere All water is frozen Venus is too hot because it has a thick atmosphere Hot enough to melt lead Pressure like being 1 mile under water

Radiation The transfer of heat through electromagnetic waves (light) Some is reflected back into space Earth emits some radiation, too Lamps Fire Some radiation is absorbed If you have stood in front of a fireplace or near a campfire, you have felt the heat transfer known as radiation. The side of you nearest the fire warms, while your other side remains unaffected by the heat. Although you are surrounded by air, the air has nothing to do with this transfer of heat. Heat lamps, that keep food warm, work in the same way. Radiation is the transfer of heat energy through space by electromagnetic radiation.

Conduction Transfer of heat through direct contact Caused by “bumping” of molecules Some conduct differently Good electrical conductors are good heat conductors Have you ever left a metal spoon in a pot of soup being heated on a stove? After a short time the handle of the spoon will become hot.

Convection The flow of heat by movement of gases and liquids Hot air/water rises, cold air/water descends This repeating cycle is a convection current Causes all weather Air in the atmosphere acts as a fluid. The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere. As it rises, the bubble cools with the heat contained in the bubble moving into the atmosphere. As the hot air mass rises, the air is replaced by the surrounding cooler, more dense air, what we feel as wind. These movements of air masses can be small in a certain region, such as local cumulus clouds, or large cycles in the troposphere, covering large sections of the earth. Convection currents are responsible for many weather patterns in the troposphere.

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