Heat Transfers: Convection

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Presentation transcript:

Heat Transfers: Convection Quick DVD: Weather – Wind Chp 2 8:05 Hot Rises Cold Sinks Caused by density differences: Hot air expands and gets less dense. Cold air contracts and gets more dense.

A Convection Cell Cool Hot

Lesson 4: Air Pressure The weight of the air above you. The more air that is above you the more pressure you will feel. Sinking air pushes down more- cold air is usually high pressure. Rising air pushes down less- hot air is usually low pressure.

Air Pressure

A Convection Cell High Pressure Low Pressure

Wind Wind travels from high pressure to low. The gradient between isobars determines the wind speed.

Big Difference in Pressure (Steep Gradient) H L

Small Difference in Pressure (Gentle Gradient) H L

H

Isobars Slowest Wind H Fastest Wind

Low Pressure Sucks! L

L Slowest Wind Fastest Wind

The Coriolis Effect The Coriolis Effect deflects things to their right in the Northern Hemisphere. Caused by the rotation of the Earth.

H

Find where the High Pressure region is.

High Pressure flows outward and clockwise (cw) (in the N. Hemisphere)

L

Low Pressure flows inward and counterclockwise (ccw)(in the N Low Pressure flows inward and counterclockwise (ccw)(in the N. Hemisphere)