14.7 pounds per square inch
As you go above the sea level, pressure of air decreases.Atmospheric pressure at sea level is 1 atm.On top of mountain, air is thin which suggests less atmospheric pressure at that place.
What type of airplane, how much does it weigh, and how fast is it traveling. Is it flying level to the horizon, or is it increasing/decreasing elevation. You have to take in to account these factors before you can answer that question.
The higher the elevation the lower the air pressure. Sea level is considered the standard for air pressure measurement.
Sea level.
Because that air pressure is the same on all sides and inside objects. If you were to seal a container at the top of Mt. Everest, Then took it down to Sea Level, It might crush (depending on the strength of the container) because the air pressure inside would be much less (the same as at the Peak where you sealed it) then it is at sea level.
Below sea level atmospheric pressure increases with depth. Air pressure at sea level is about 14.7 psia. Air pressure below sea level would be slightly higher.
1013 mb
1.5 Kilos is the heaviest, but typically the ball would weigh around 800 grams
With a barometer.
yes
The pressure is very low. At the bottom of the mesosphere, the pressure is about one thousandth of sea level air pressure. At the top of the mesosphere the pressure is down to only about one millionth of sea level pressure.
The air pressure is greatest at sea level.
The lower you go into the sea level, the greater the air pressure. The higher you go above the sea level, the lower the air pressure.
Sea level pressure, sometimes as mean sea level pressure.
Sea level pressure.
Air pressure depends mainly on altitude - how high you are above sea level. The lattitude doesn't make much difference.
The highest altitudes have the lowest air pressure. Air pressure increases as altitude decreases. Above sea level is lower pressure; below sea level is higher pressure.