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Which is heavier, space aluminum or plastic? Space aluminum is generally heavier than plastic. Aluminum has a density of approximately 2.7 grams per cubic centimeter (g/cm³), whereas the density of plastic can vary widely depending on the type, but it is typically around 0.9 to 1.5 g/cm³. This means that for the same volume, aluminum will weigh significantly more than plastic.

The reason for this difference lies in the atomic structure of the materials. Aluminum is a metal, and metals generally have higher densities than non-metals like plastics. The metallic bonds in aluminum allow for a more compact arrangement of atoms, leading to a higher density. Plastics, on the other hand, are polymers made up of long chains of molecules, which can be more easily separated and thus have a lower density.

For example, a common type of plastic used in aerospace applications is polyetherimide (PEI), which has a density of about 1.2 g/cm³. Even at the higher end of the plastic density range, it is still lighter than aluminum. This is why aluminum is often used in aerospace and other high-performance applications where weight is a critical factor.

In summary, space aluminum is heavier than plastic due to its higher density, which is a result of its metallic composition and atomic structure.