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Warm air molecules are further apart because they have a higher  speed. The higher the speed the further apart molecules will push  themselves.es. The molecules in a solid are tightly packed, making it hard. They also move, or vibrate very slow. The molecules in a liquid are a little less tight then those in a solid â¦ .
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. Solid at Different Temperatures. Mass of the object remains the same, however. Solids, liquids and gases all expand when heat is added. When heat leaves all substances, the molecules vibrate slower. The atoms can get closer which results in the matter contracting. Again, the mass is not changed.