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Phase changes happen when matter changes from one state to another, like ice melting For example, a liquid such as water starts becoming a gas when it is heated to its boiling point or starts to freeze when it is cooled to its freezing point. Changes in temperature or pressure are why these phase changes happen, making molecules move differently
There are eight phase changes, including freezing, vaporization, and ionization of different states. When external conditions (such as temperature or pressure) change, the state of matter might change as well Because water is extremely versatile, it changes phases rapidly
The states of water are gas, liquid and solid
Water cycles through these phases in nature. A phase change or phase transition is a change between solid, liquid, gaseous, and sometimes plasma states of matter The states of matter differ in the organization of particles and their energy. Vaporization if the water is hot enough, it starts to boil
Bubbles of water vapor are formed in the boiling water This happens as particles of liquid water gain enough energy to completely overcome the force of attraction between them and change to the gaseous state The bubbles rise through the water and escape from the pot as steam The process in which a liquid boils and changes to a gas.
Understand that a change in state (solid to liquid or liquid to gas) is a physical change, not a chemical change
Recall that in a physical change, the molecules themselves remain intact Only the arrangement and energy of the molecules change. Review the key concepts of the lesson by discussing the reversible nature of water's state changes Encourage students to share what they found most interesting.
The water cycle is the path that all water follows as it moves around earth Water changes between three states of matter — solid, liquid, and gas — in the water cycle Liquid water is found in oceans, rivers, lakes, and even underground Solid ice is found in glaciers, snow, and at the north and south poles
Water vapor — a gas — is found in earth’s atmosphere.
Substances can change state, usually when they are heated or cooled For example, liquid water turns into steam when it is heated enough, and it turns into ice when it is cooled enough In short, water changes state thanks to variations in temperature and pressure, allowing it to continue its natural cycle and its close relationship with life on the planet. Matter occurs in different states
Solid, liquid, gaseous and plasma
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