Explanation:

Emissivity of Asphalt:
Asphalt has a high emissivity value of 0.90. Emissivity is a measure of how efficiently a surface emits thermal radiation. A value of 1.0 would indicate a perfect emitter, while a value of 0.0 would indicate a perfect reflector.

Importance of Emissivity:
Emissivity is an important parameter to consider in applications where heat transfer through radiation plays a significant role. Knowing the emissivity of a material can help in determining its thermal behavior when exposed to various heat sources.

Factors Affecting Emissivity:
- Surface texture: Rough surfaces tend to have higher emissivity values compared to smooth surfaces.
- Surface finish: Dull or matte finishes usually have higher emissivity values than shiny or polished finishes.
- Wavelength of radiation: Emissivity can vary with the wavelength of the radiation being emitted or absorbed.

Applications of Emissivity:
- Building construction: Emissivity values are considered in the design of buildings to optimize energy efficiency.
- Aerospace industry: Emissivity values are crucial in the design of spacecraft and thermal protection systems.
- Manufacturing processes: Emissivity values are important for processes involving heat treatment and thermal processing of materials.
In conclusion, asphalt has a high emissivity value of 0.90, indicating its efficiency in emitting thermal radiation. Understanding the emissivity of materials is essential in various engineering applications where heat transfer is a critical factor.