What is the density of Helium?

The density of helium is accurately given as 0.1785 g/L at standard temperature and pressure (STP). This low density is a key characteristic of helium and is significant in practical applications. Helium is much lighter than air, which is why it is commonly used in balloons and for purging in various industrial processes. Its low density contributes to its ability to rise in the atmosphere and provides buoyancy when used in lighter-than-air craft. Understanding the density of gases like helium is essential for various scientific, medical, and engineering applications, as it influences the behavior of the gas under different temperature and pressure conditions.