比较固体、液体和气体并对它们进行分组

Do children refer to solids, liquids and gases that have been introduced previously?   Do they state that solids retails their shape and volume, liquids take the shape of the container but do not change in volume and gases change in both shape and volume to fill the space they are in?

Quizzes available in pupil zone.

Unit knowledge organiser and test available in unit documents area.

The Science Behind the Science
 

Water is one of the most important substances on Earth. Water can be found in three different states: liquid, ice and vapor. Liquids are wet. We can drink water and we can swim in it. We use it in agriculture to grow food, in our homes to clean our appliances and in hydropower to create energy. These are only a few uses of water. When water gets below 0 degrees, it freezes and becomes ice. Here are a few benefits to having ice: it reflects the sunlight, it influences ocean currents, it insulates the air, it limits severe weather and supports both native wildlife and native people. As you can see, it is very useful.  

When it gets above 100 degrees or evaporates and starts to boil, it turns into a gaseous state known as vapour. Water vapour is a greenhouse gas (but not a bad one), it is the reason rain and clouds exist, it is a big component of the world’s electricity and the reason why animals such as frogs can stay hydrated.  

Mission Assignment: Let’s look at water. Ice is the solid form of water. It has a certain crystalline structure whereas water molecules are arranged regularly. The water is more compact than ice which makes ice a lot less dense than water which explains why its ability to float on water.