When an object is heated .the molecules that make up the object
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When heat is added to a substance the molecules in it starts moving faster.
The space between them increases thus expanding and taking up space.
Thus heat can be transferred from one object to another.
But the mass of the object remains the same.
The state of matter will be determined by the spacing between the atoms.
Therefore liquids expand when it is heated and contract when it is cooled down.
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When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
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