Which medium is commonly used in low voltage applications for its high dielectric strength?

In low voltage applications, air is commonly utilized due to its high dielectric strength, which refers to the ability of a material to withstand electric fields without conducting electricity. Air acts as an insulator, preventing electrical discharges between conductors and allowing for safe operation in various electrical systems. Its natural abundance and effectiveness at insulating across relatively short distances make it an ideal choice for many low voltage setups.

Oil, while it also has good dielectric properties and is often used in high voltage applications, can be more complex to manage due to concerns over leaks and environmental impact. Water is a conductor of electricity, making it unsuitable for insulation purposes. Gas can be used in specific high voltage contexts, but it is less common in standard low voltage applications compared to air, especially in environments requiring simple and effective electrical insulation.