What does the Reflectivity of a surface refer to?

The reflectivity of a surface specifically pertains to its capacity to reflect solar radiation. This property is important in various fields such as architecture and environmental design because it influences energy performance and thermal comfort in buildings. High reflectivity surfaces can help reduce heat absorption, thus contributing to lower energy costs for cooling. This is particularly relevant in climates where solar gain can significantly impact indoor temperatures. The concept of reflectivity is often associated with materials like roofing and paving, where choosing a highly reflective material can mitigate the urban heat island effect and enhance energy efficiency.