What is weather?Weather

consists of the conditions of the atmosphere at a particular time and place.

Climate

Climate is the general weather of an area over a long period of time, and includes seasonal changes in weather.

Factors Affecting Weather

1. Air Pressure2. Heat Energy3. Wind4. Moisture

Air Pressure

Air Pressure is a measure of the weight of air pressing down on a given area of the Earth’s surface.• Changes in air pressure tell

you that changes in the weather are on the way.

• Low pressure means cloudy, rainy weather, and when air pressure is high, it means sunny, fair weather.

Wind

• Differences in air pressure cause wind, or moving air.

• Air moves from areas of high pressure to areas of low pressure.

• The greater the difference of air pressure the faster the wind blows.

• An anemometer measures the speed of wind.

Heat Energy

Heat is the transfer of thermal energy from a hot object to a cooler one.

3 Ways:1. Radiation2. Convection3. Conduction

Radiation

• Radiation is the direct transfer of energy by electromagnetic waves.

• You cannot see infrared radiation, but you can feel it as heat!

Conduction

• Conduction is the direct transfer of heat from one substance to another.

Convection

• Transfer of heat energy in a fluid, in which warmer fluid rises and cooler fluid sinks.

Moisture

• Precipitation happens when water vapor condenses, and the drops of water in the cloud grow larger. Eventually, the heavy drops fall back to Earth as rain, snow, sleet or hail.

• Condensation:• Transpiration:• Evaporation: