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建立人际资源圈States_Of_Matter
2013-11-13 来源: 类别: 更多范文
States Of Matter
The definition of matter is something that takes up space and has a mass. It
has to have inertia and weight when gravity is present. Matter is commonly
known to exist in three states: solid, liquid, and gas. Scientists also acknowledge
two other states: plasma and Bose-Einstein condensate (A). The general properties
of matter come from having mass and taking up space. Even though a substance
might change its state, it still consists of the same atoms. The state of matter
depends on its temperature, which is the average kinetic energy of the substances
molecules (B).
The molecules of a solid are held closely together, and dont have much
free space to move. This is why a solid holds its shape. The atoms do not have
enough kinetic energy to move out of their positions. This limitation gives a solid
a limited volume and shape. The particles of most solids are arranged in
duplicating geometric patterns called crystals (C). As the temperature of a solid
increases, the molecules eventually free themselves from their fixed position and a
phase change occurs. Depending on the element, the change from solid to liquid
will happen at a specific temperature known as the melting point (B). When that
happens,
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