Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines - Discussion

In my opinion, in high altitude the pressure is very low so higher power is required to reach the desired than sea level for same compressor ratio. So higher power is required.

From my point of view answer is more power is required.

As per my opinion, at high altitude power required to compressed air is more because temperature of air at height is more & Pressure is less Called less dense air. So specific volume of air is high due to high temperature & compressor consumes more power for same pressure ration on sea level to compress high temperature air.

At higher altitudes molecules of air are few, hence a compressor supplies smaller volume of air at a higher altitude so it requires less power.

Why is it so?