defined as the highest altitude at which an aircraft can maintain a rate of climb of 100 feet per minute
altitude above which a plane cannot climb faster than a given rate
Height at which maximum rate of climb is 100 feet (30.48 meters) per second
Altitude at which cabin crews can serve drinks.
In aeronautics, the service ceiling is the density altitude where the flying in a clean configuration, at the best rate of climb airspeed for that altitude, and with all engines operating and producing maximum continuous power will produce a 100 feet per minute climb. Margin to stall at service ceiling is 1.5g.