All things are made up of matter, and there are three different forms that matter can exist in--solid, liquid, and gas. Some matter can change from one state to another when the temperature changes. When an object is a solid, its molecules are arranged in a pattern and don't move very much. In a liquid, molecules are farther apart from each other and move around instead of sticking together. The movement is what makes a liquid be fluid and take the shape of a container it is in. The molecules in a gas are even further apart and move very quickly with no pattern at all. molecules of substances look like as a solid, liquid, and gas.
Some substances can have two or more different states of matter. For example, peanut butter does not flow like a liquid. It acts more like a solid even though it is very soft. However, if you use heat to melt peanut butter, its state will change and it will flow like a liquid!
Properties of Water
Water is a very impressive and unique substance. It is the only natural substance that can exist in all three states of matter at the temperatures normally found on Earth. Water is usually a liquid, but when it gets to 32°Fahrenheit (F), it freezes into ice. Ice is the solid state of water. When water reaches 212° F, it boils. When it begins to boil, some of the water turns into steam. Steam is the gas state of water, and is also called water vapor. There is a lot of water vapor in the air we breathe.
Water is something that all living things need in order to stay alive. A human can live for several weeks without food, but only for a couple days without water. Water makes up about 70% of our bodies, so going long periods of time without drinking any water will make you dehydrated and could make you very sick.
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