Water has three types of changes: solid (ice), liquid (water) and gas (water vapor). These three changes are called “three-state changes”
In our life, all humans need to drink water everyday. When the weather is very hot, we eat ice or ice cream. We use water to shower, make cup noodle and clean the house, etc.
Water vapor -> The use of water vapor to promote things: the water heated, will continue to produce water vapor, the use of steam power can make the windmill turning, steam can be used more to promote more great things, such as: Watt invented the steam train.
Water vapor of gas: There is no certain shape and size, invisible and intangible.
Ice -> Production Popsicle: water will form a cold ice, so you can add a variety of things in the water to ice, made of delicious popsicles or other ice class things.
Have a certain shape and size, visible also tangible
Water -> Distilled sea water: no fresh water in the sea to drink, the water can be the first evaporation, and then collect water vapor, the water vapor after cooling without salty taste, you can quench their thirst.
There is no certain shape, but a certain volume, shape, with the container to change the different, visible also tangible, will wet hands.
In this section, we talk about temperature. We use temperature to do lots of things. I heard a experiment before, first thing you need to put your hands into a 45~50 degrees C’s water. 3 minutes later, put your hands into a 30 degrees C’s water. Your hands will feel colder. Conversely, you put your hands into 15 degrees C’s water. 3 minutes later, put your hands into a 30 degrees C’s water. Your hands will feel really hot.
Melting and Boiling points ->
“Solid” -> melting -> “Liquid” -> Boiling -> “Gas”
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