How can you tell that air is around you 1

2. A boy sleeping & covered with
a blanket
Do you that
Earth has a
blanket too?
Really, How is
that?
Yes, It is called
atmosphere

3. What is Atmosphere?
- It is a thin blanket of air that surrounds our planet
Earth.
- - It is made up of many gases.
“Oxygen – Carbon dioxide – ..etc”
It’s a mixture of gases

4. Weather
The weather is so
cold & snowy

5. What is the weather?
It’s the condition of
atmosphere at a given
time & place
Christmas time
USA

6. - Weather changes depending on many conditions:
Does weather changes?
1- Time of the day
Example: In the Desert
During the day During the night
- The weather is very hot - The weather is cold

7. 2- Seasons
Spring
It’s rainy & warm
Summer
It’s hot & sunny
Winter
It’s cold & snowy
Autumn
It’s windy

8. 3- Place

9. - Measuring the weather depends on many factors:
How to measure weather?
1- Air Temperature
2- Wind speed & direction
3- Humidity
4- Precipitation
5- Air pressure

10. 1- Air temperature
-It describes how hot or cold the air is.
Example: During Summer During Winter
- Temperature is high - Temperature is low
-Air Temperature is measured using: Thermometer
“ In Celsius / Fahrenheit”

11. 2- Wind
There is a strong wind, the weather is windy

12. What’s the wind?
It’s the moving air
“When the sun heats the surface of the Earth, the
surface warms up the air, so the air moves up & the
cold air gets down causing the wind”
- We measure the wind speed
using: Anemometer
- We measure the wind direction
using: Wind vane
It points to the direction
from which the wind blows
The faster the wind
blows, the faster
the cups spin

13. 3- Humidity
- Some times the air around us feels damp & sticky
like: In Alexandria
- This is because of the “Humidity”
{Humidity: is the measure of how much moisture
(water vapor)is in the air}

14. -The more the water vapor in the air, the more the
humidity is in the air.
-Examples:
Desert Rain forest
- Has low humidity - Has high humidity
- We measure the humidity in the air using: Hygrometer

15. 4- Precipitation
Any form of water that fall from the clouds is precipitation
Does this
mean that
rain is
precipitation?
Yes, of course..
And snow too
is a kind of
precipitation
I wonder how
many kinds of
precipitation
are there?

16. Kinds of precipitation
Rain Snow Sleet Hail
“Flakes of snow
mixed with water
drops”
“Chunks of snow”
As the size of small
ball
Snow fall as
crystals”

17. -We measure the amount of rain fall using:
Rain gauge