Means something that is moving either closer or further away from ground or sea level. An aircraft taking off and climbing will experience a change in altitude. when it comes down to land it'll experience another.
Mass does not change with changes in altitude or elevation. Weight on the other hand does change. However, on earth the change from sea level to the top of a mountain would be extremely small.
Air pressure falls of as one gains altitude. At high altitude the air pressure is very low but it does not "falls drastically", which implies a sudden change.
the angle between an object in the sky and the horizon
Mean sea level (MSL) which is the average level of the sea. Determinig "sea level" is a very complex measurement. All other altitude measurements in aviation, in one way or another, are referenced from the mean sea level.
As of 2021, Betelgeuse has an azimuth of around 225 degrees and an altitude of about 27 degrees when observed from the northern hemisphere. These values will change throughout the night and over the course of the year due to the Earth's rotation and orbit.
The change in pressure is highly affected by altitude.
Increased altitude means decreased air pressure.
The density of air decreases when the altitude rises.
I am assuming that you mean mass of an object. The answer is no, it does not change. Mass (Density) stays the same wherever the object is, only its weight will change if the force of gravity is different.
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As altitude increases, the rate of change of air pressure decreases. This is because the air becomes less dense at higher altitudes, leading to a more gradual decrease in pressure with increasing altitude.
By farting
Yes, air pressure decreases as altitude increases.
Because pressure decreases as you go up in altitude and increases when you go down in altitude. Hope this helped!
An altitude is measured from mean seal level on Earth. So asking what the planet's altitude is, is a nonsense question.
Mass does not change with changes in altitude or elevation. Weight on the other hand does change. However, on earth the change from sea level to the top of a mountain would be extremely small.
I KNOW FROM MY mind that altitude means going up.