Why is water heavier than air?

Water is heavier than air primarily due to differences in the density of the two substances. Density is a measure of how much mass is packed into a given volume. The density of water is much higher than the density of air, which is why water is heavier.

Molecular Composition: Water molecules are composed of hydrogen and oxygen atoms, while air is a mixture of different gases, primarily nitrogen (N2) and oxygen (O2). The molecular weight of water (H2O) is significantly higher than that of the individual gases in air.

Density: The density of a substance is determined by both its molecular weight and how closely its molecules are packed together. Water molecules are relatively compact and closely packed, resulting in a high density. In contrast, the molecules in air are more spread out and lighter, leading to a much lower density.

States of Matter: Water is a liquid at room temperature and atmospheric pressure. Liquids generally have higher densities than gases because their molecules are closely packed and have less kinetic energy. In contrast, air is a gas, and the molecules move more freely and have higher kinetic energy.

As a result of these factors, water is about 800 times denser than air at room temperature and atmospheric pressure. This higher density is why water is much heavier than an equal volume of air. When comparing the weight of an equal volume of water and air, the water will always be much heavier due to its higher density.

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