Is radon gas approximately seven times heavier than air?

Radon gas is indeed approximately seven times heavier than air, which supports the assertion in the question. The density of radon is about 9.73 grams per liter, while the average density of air at sea level is approximately 1.29 grams per liter. This significant difference in density leads to radon being classified as a heavy noble gas.

Understanding the density of radon in comparison to air is particularly important in the context of radon measurement and mitigation. Since radon is heavier than air, it tends to accumulate in lower areas of a structure, such as basements or crawl spaces. This property impacts how radon is measured and the strategies used to ventilate and reduce radon levels in buildings.

In contrast, the assertion that radon is not heavier than air would overlook essential characteristics of the gas and its behavior in indoor environments where it is a health concern. Thus, recognizing radon's density is crucial for effective radon management and safety practices.