Why is bleed air considered valuable in aircraft systems?

Bleed air is considered valuable in aircraft systems primarily because it is at high pressure and temperature. This characteristic makes it suitable for various functions within the aircraft. For instance, bleed air can be used for engine starts, cabin pressurization, heating, and de-icing systems. The high pressure allows it to perform work effectively, while the elevated temperature helps in efficiently heating the cabin and other components requiring thermal control.

The performance aspects of bleed air are critical, particularly in modern aircraft where efficient control of environmental conditions and engine operation can enhance overall safety and capability. Therefore, the properties of bleed air in terms of pressure and temperature directly contribute to its utility and effectiveness in supporting numerous aircraft systems.