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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 a mass of cold air overtakes a mass of warm air, the cold air being denser, stays on the surface and undercuts the warm air violently. Surface friction tends to slowdown the surface air while a sharp fall in temperature, a rise in pressure and rapid clearing usually occur with the passage of the cold front.n occasion, an advancing warm front rides up over a pool or layer of cold air trapped on the ground. A station on the ground does not experience a change of air mass because the front passes overhead. This is known as an upper warm front.