Aircraft use an altimeter to measure the current altitude. The altimeter uses barometric pressure to sense the altitude. As you go up in altitude the air gets thinner. The higher you go the thinner it is. The altimeter is basically just a very sensitive barometer (a barometer is a device used to measure air pressure), so sensitive in fact that it can reliably detect differences in altitude as small as 10 feet.
The drawback with using this method is that barometric pressure varies greatly depending on the local weather. Thunderstorms, for example, always bring with them a sharp increase in barometric pressure, and so pilots must always ensure that their altimeter is set to compensate for these differences.
Another drawback with this method is that it only measures altitude above sea level. When you take into consideration that as you get away from the coast, the ground may well be thousands of feet above sea level, you can see why this may pose problems. As a result all aviation charts have the altitudes of all airports, and most other objects posted on them.
To combat these problems, many more sophisticated aircraft use radar or laser systems to determine their altitude above ground. Additionally, GPS can be used to determine altitude, which is getting more and more common. Neither of these solutions seek to replace the altimeter, but flight crews do use them in concert to maintain accurate information on their position. Also, (for altitudes generally below 2500') radar altimeters are used to measure actual height above the ground.
A ruler or tape measure is used to find the height of an airplane, usually
while it's on the ground.
When it's flying, an altimeter is used to find its altitude ... its distance
either above ground or above sea level.
Depending on the size of the plane and where it's going, the height can be anywhere from about 1500 feet to over 41000 feet.
Tie a peice of string to it and when it reaches its peak grab it and measure!
A heightometer.
Multimeter is an instrument that measures electric equipotential. Equipotential lines can be determined by connecting various points of electric potential or voltage.
If the question is about how high the airplane is in the atmosphere, I would think that an altimeter would be an answer to consider.
what are all the instruments use to measure altitude
The sextant is used in celestial navigation.
an anemoeter
Used to be trigonometry, but now they use GPS.
S(he) uses an altimeter which a kind of airborne barometer.
An altimeter does not actually measure altitude directly, but rather just atmospheric pressure. So an altimeter is actually a barometer created for a specific purpose. See related link The altimeter measures the height above the ground and has a pointer which is adjustable depending in which air field you are taking off on. it measures the pressure of the air as you get higher off the ground the pressure reduces therefore it is able to determine your height above ground.
fathometer is an instrument used to measure the altitude of na object above a fixed level , fathometer measures the sea depth
The airplane was flying at a very high altitude.
50km in height
plane was flying at 650m
An altimeter is a piece of apparatus which measures someone's altitude.
I have hiked up to the altitude of 14,000 feet. That airplane will be above the altitude of those clouds.
A tape measure.
This instrument is a balance.