UNIT 10 WEATHER AND CLIMATE

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UNIT 10 WEATHER AND CLIMATE

10.1 Measuring air temperature
The weather report usually shows the minimum and maximum temperatures for each day.
The temperature of the air around us is measured using a room thermometer.

10.2 Humidity
Humidity or relative humidity is a measure of the amount of water vapor in the air. Water vapor is water in its gaseous state.
A hygrometer measures how humid or dry the air is.

10.3 Atmospheric pressure
We know the present of the air because of wind and atmospheric pressure. Atmospheric pressure is the force of air pushing an area.
10.4 understanding the features of weather
There are many factors that affect weather of a region. These factors are air temperature, wind speed, and direction, clouds and rainfall.
  • Air temperature is usually higher during the day than during the night. Air temperatures change due to cloud cover and presence of rain.
  • Air moves from an area with high pressure to an area with low pressure. This movement cause wind. The greater the difference in the atmospheric pressure, the stronger the wind.
  • Clouds form when water vapor in the air above the surface of the earth cools and changes to visible water droplets.
  • Wind causes the small water droplets in the clouds to collide and form larger water droplets. The larger water droplets the fall to the ground as rain.

10.5 factor that affect climate
There are many factors that affect the climate of a region. These factors are altitude, distance from the equator, distance from the coast and the presence of trees and plants.

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