Learning about the Water Cycle

Learning about the Water Cycle

We are learning about the Water Cycle.

Here are some links to help us learn:

We have got our own water cycle investigation ready.  We have filled a glass with water, measured how high the water came and marked a line on the glass to show the level of water in the glass.  We think that this water will evaporate if we leave it near the radiator in class. We covered the glass with cling film so if the water does evaporate it might condense into a cloud and we might be able to make our own rain.  We can’t wait to see what will happen.

In the meantime, teacher showed us how to make a cloud in a bottle.  If we do this at home we will need an adult’s help because we need to use a match.  You put a little water into a plastic bottle, then drop in a lighted match and put the lid on very quickly.  If you squeeze the bottle a few times you will see a cloud forming every time you stop squeezing the bottle. This is a real cloud!

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Clouds are formed when water droplets in the air cool and then collect on dust particles.

In this demonstration, the dust particles were provided by the smoke from the match.

The air inside the bottle was cooled by releasing the pressure after the bottle was squeezed.

The temperature is changed by squeezing the bottle: the amount of air within the bottle is constant, but squeezing the plastic bottle changes the volume of the gas.

 Expanding the bottle causes a lowering of the air temperature – in this case, enough to cause the water gas to form a liquid – the cloud.

We made lovely water cycle pictures in art:

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