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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¦ .
The molecules are packed closer together. The amount of water vapor in the air also affects the density of the air. The more water vapor that is in the air, the less dense the air becomes. That is why cold, dry air is much heavier than warm, humid air.