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The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less.Click to see full answer. Keeping this in view, why does warm air have a lower density than cold air?Cold air is denser than warm air. 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.Also Know, why does warm air rise and cold air sink? As hot air from the earth’s surface rises, it soon becomes cold air as it nears space, according to Historyforkids.org. As hot air cools it sinks back to the surface of the earth, where it gets warmed by the ocean only to rise again. The main reason that hot air rises is because sinking cold air pushes it up. Also to know is, what does it mean when air is less dense? A: We can tell the density of a gas by how packed together molecules are. The more air molecules in once space, the denser the air. As air gets warmer, the air molecules have more energy. Since the molecules are going off everywhere, the air becomes less dense.Which is lighter warm air or cold air?Warm air is lighter than cold air because they have more heat energy, which results in the increase in distances between the molecules. This decraeses the density, and hence makes it lighter than cold air.

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