How does altitude affect barometer accuracy?
fig1 Two accurate barometers are used. One barometer is located at sea level and the other barometer is located directly beside it, on top of a 5000ft cliff. On an average pressure day of 30.0inhg Sea Level Pressure, the cliff top barometer is properly offset so it indicates 30.0inhg (although the actual pressure at this altitude would be 24.96inhg) fig2 On a Low pressure day of 29.0inhg Sea Level Pressure, the sea level barometer will indicate 29.0inhg, while the cliff top barometer will indicate 29.17inhg (a 17% error, the actual pressure has only dropped 0.83inhg at this altitude) fig3 On a High pressure day of 31.0inhg Sea Level Pressure, the sea level barometer will indicate 31.0inhg, while the cliff top barometer will indicate 30.83inhg (a 17% error, the actual pressure has only gone up 0.83inhg at this altitude) The higher the barometer is, the less accurately it will indicate Sea Level Pressure The only way to correct for this, is a barometer calibrated for use at a specific al
