Which gas is typically injected between the panes of high-efficiency windows for better insulation?

The gas that is commonly injected between the panes of high-efficiency windows to enhance insulation is Argon. This gas is selected due to its inert nature and density, which contribute to thermal insulation. Argon has a lower thermal conductivity compared to air, which helps in reducing the amount of heat transferring through the window. This property allows windows filled with Argon gas to better maintain temperature, providing improved energy efficiency for buildings.

While other gases like Krypton are also used for insulation, Argon is more widely employed due to its cost-effectiveness and availability. Krypton offers slightly better thermal performance but is more expensive, making Argon the preferred choice for most residential applications.