ALTIMETER
Altimeter or altitude meter is an instrument used to measure altitude of an object above a fixed level.
It is extremely important instrument in the field of aviation![aviation.PNG](https://steemitimages.com/640x0/https://steemitimages.com/DQmNbDxiqPoHwLtbuiLrstADN9RGQvZsVDDNAiYmbhjwXQo/aviation.PNG)
when a flying an aeroplane pilot need to know his exact altitude
It is based on dropping of atmospheric pressure with height![altitu.PNG](https://steemitimages.com/DQmbJs59fM8HqvYBHBugJt9TCBpB8egneP329onVjBAp4kT/altitu.PNG)
![al.1.PNG](https://steemitimages.com/640x0/https://steemitimages.com/DQmbY185Dc5yagm49e7R4aien5JS6WN2iU7xSbDbeE5xmTn/al.1.PNG)
note:image taken from google
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