AIR WATER AND WEATHER

BY ANIRUDDH KOMMAJOSYULA

III C

DELHI PUBLIC SCHOOL, NERUL

Air is all around us but we cannot see it.

We can feel air when it moves.

WHAT DOES AIR CONTAIN?

If you take a glass of very cold water and place it on a

table, you will soon notice water drops sticking out on

the outer side of the glass. Why?

This water didn’t leak through the glass. It came from

the air.

Air contains water in the form of water vapour.

Air also contains important gases like oxygen and

carbon dioxide.

We breathe in oxygen.

Air may also contain dust particles and germs.

Theses can stick to our body easily. That is why we

should wash our hands before eating.

Water droplets

WATER

Water is very important for life on earth.

All living things need water.

We use water for various purposes, eg.

Drinking cooking and watering plants.

Ice, water, and water vapour are the three

forms of water.

SOURCES OF WATER

The water from rain is called rain water.

When snow on mountains melts, it flows into rivers.

This is another source of water.

Rainwater fills puddles, ponds, lakes, rivers and

streams.

We build dams and canals to use river water.

Rainwater also seeps into the ground. We can use

this by digging wells and hand pumps.

DRINKING WATER

Water from Lakes, rivers, ponds and wells may not

always be clean.

Dirty water contains germs.

Drinking dirty water can make us ill.

We should boil water before drinking.

Boiling water can kill germs.

We should keep clean water in closed containers.

SAVING WATER

We should not waste water.

We can save water in many ways

We should not let the tap run when we brush our teeth.

We should not waste water while bathing or washing.

If we wash many fruits, we should wash them with water

in a big bowl. Do not use running water.

Rainwater can be collected in tanks, drums and

buckets. This can be used for watering plants,

cleaning cars, and cleaning floors.

Drinking water

Watering the

plants

Water is used for

cooking

What happens to the water when wet clothes dry in the sun?

The water present in the wet clothes changes into water vapour.

What comes out of the vessel when water boils?

It is steam that comes out.

Steam is also called water vapour.

The change of water to water vapour is called evaporation.

What happens when a steel plate is held on top of a hot vessel?

We see tiny droplets of water on the plate.

On touching the cold plate, the steam cools down and changes back into droplets of water.

The change of water vapour to water droplets is called condensation.

EVAPORATION CONDENSATION

WATER CYCLE

The sun heats up the water from rivers, ponds, lakes, oceans, and plants. This water evaporates into the air as water vapour.

Water vapour rises in the air. It cools down to form small water droplets.

During condensation tiny water droplets mix with dust and other things to form clouds.

Inside the clouds, the tiny water droplets join to form big drops.

When water drops in the cloud become too heavy to remain in the air, they fall down as rain.

In places that are very cold, the water drops freeze into ice and fall down as snow.

This rain water or the snow fills the rivers, ponds, and lakes as this cycle continues.

The cycle involving the change of water into water vapour and then to water again is called water cycle.

WATER

CYCLE

WEATHERTHE GENERAL CONDITIONS OF AIR AROUND US IS CALLED W EATHER. CHANGES IN

WEATHER ARE CAUSED BY THE SUN, WIND, AND WATER VAPOUR IN THE AIR.

Sunny days are usually

hot.

Noon is the hottest time of

the day.

Mornings and evenings

are cooler.

Moving air is called wind.

When the wind blows

slowly, it is called a

breeze.

Strong wind along with

rain or snow is called a

storm.

Sometimes storms are

accompanied by lightning

and thunder.

SUNNY DAYSWINDY AND CLOUDY

DAYS

SUNNY DAY

A STORM DAY

A CLOUDY DAY

SEASONS

Every few months the weather changes.

This change gives rise to different seasons.

There are five main seasons-summer, winter,

monsoon, autumn, and spring.

Summer is the hottest time of the year and winter is

the coldest.

It rains during monsoon.

Leaves fall in autumn.

In spring, there are flowers everywhere.

Change in season effects the kind of clothes we

wear, the food we eat, and the activities we do.

SUMMER

WINTER

MONSOON

AUTUMN SPRING