Height is the measure of vertical distance, either how "tall" something or someone is, or how "high" the position is.
Distance is a numerical description of how far apart objects are.
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For example, "The height of that building is 50 m" or "The height of an airplane is about 10,000 m".
An airplane or aeroplane is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller or rocket engine.
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When the term is used to describe how high something like an airplane or a mountain peak is from sea level, height is more often called altitude.
Mean sea level is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.
Altitude or height is defined based on the context in which it is used.
In a cartesian space, height is measured along the vertical axis between a specific point and another that does not have the same y-value.
If both points happen to have the same y-value, then their relative height equals to zero.