system
Given the following post, respond as if you're commenting on Reddit:
human
Since vacuum cleaners operate by creating a pressure differential between the atmospheric pressure and the internal pressure. Does that mean vacuum cleaners operate less efficiently at higher altitudes?
gpt
Well the fan is probably tuned for the peak performance of the motor.  At higher altitudes the fan would spin faster (less air, therefore less torque), and probably be off peak motor speed.  At higher rpms the back emf robs the system of torque, degrading efficiency.