What is watt m2?

Watt per square meter (W/m²) is a unit of measurement used to describe the amount of power or energy transmitted or received per unit area. It is commonly used in solar energy applications to measure the amount of solar radiation reaching a specific surface area. The more watts per square meter a surface receives, the more energy it can convert into electricity or heat. The unit can also be used to measure the power density of a particular system, such as the output of a laser or the intensity of a sound wave.