Primary Three Second Term Basic Science Lesson Note

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PRY 1 SECOND TERM BST LESSON NOTE

Week: One

Class: Primary Three

Topic: Revision of Air

Behavioural objectives: At the end of the lesson, pupils should be able to:

  1. describe wind as air in motion.
  2. describe their feelings when the wind blows against their bodies.
  3. explain the effects of air.
  4. list the uses of air

Instructional material/Reference material: Pieces of paper, Feathers, Pictures of windmills, Pictures/charts showing the effects of wind.

Building Background /connection to prior knowledge: pupils are familiar with the air in their environment.

Content: Air

Air: is defined as a breeze; a gentle wind, it is understood as a gaseous mixture of nitrogen, oxygen, and various trace gases or Air is an invisible form of matter that flows freely and is in the gaseous state.(usually) The apparently open space above the ground which this substance fills, (historical) formerly thought to be limited by the firmament is now considered surrounded by the near-vacuum of outer space. It can be felt.

TYPES OF AIR

  1. Cold Air -: which is found anywhere behind a cold front. When a cold front move through an area the temps rapidly drop especially during the late fall and early spring.
  2. Warm Air -: warm air which is best found behind a warm front. When a warm front move through an area the temps will gradually warm from the South to the North.
  3. Moist Air -: This air is best defined as having moisture present in it. Anything greater than 1% would be described as being moist. The best places to find this type of air is along the Southeast part of the United States due to the moisture from the Gulf of Mexico.
  4. Dry Air -: Dry air is described as having less than 1% of moisture in it. The best location to find this type of air is in the Southwest part of the United States and also in the Middle East.

EFFECTS OF AIR

  1. Air cause rain or dew to dry more quickly thus reducing the risk of fungal infection.
  2. Air also affects the thermal conditions of a vineyard i.e it reduces heat.
  3. Air also support combustion i.e it helps fire to burn quickly and easily.
  4. When it is blown in the night it feels cool in the body.
  5. When blown in the day it feels hot or warm in the body especially in the Northern area.

USES OF AIR

  1. It is a significant supplier of energy -: all living plants and animals depend on oxygen to generate valuable energy.
  2. It is a conducting medium for sound -: we can hear the sound of speech or noise, etc. only when there is the air around us. It happens because the wind is a good sound conductor. Without a medium, we will not be able to hear anything and won’t be able to produce the sounds.
  3. It is responsible for the pollination of crops: plants produce male gametes in pollen grains. These pollen grains move from the male flower to the female flower and combine with female gametes, which is called pollination. This may occur in flowers growing on the same plant or between remote plants with the help of wind or air power.
  4. It keeps the balance of the temperature on the Earth’s surface when it’s summer. When the sun strongly heats the Earth’s surface, the surface temperature of the ground is growing rapidly, but it grows slowly on the surface of the ocean or sea (this is because a solid substance is heated faster than liquid water). Thus, the air that is warmed at the Earth’s surface rises up, and the cold one from the sea surface transfers to the surface of the ground which minimizes the temperature rise.
  5. It helps in drying (moisture balance): the ground being wet from the rain dries due to air. On a wet surface, it is very moist. Thus, the moist layers are replaced by less humid or dry layers of air. The new dry layer on the surface absorbs moisture from the wet surface, and the cycle continues until the surface is dry.

Evaluation: The teacher asked questions on what has been taught.

  1. describe wind as air in motion.
  2. describe their feelings when wind blows against their bodies.
  3. explain the effects of air.
  4. list the uses of air

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