How does altitude affect a barometer?

Question

How does altitude affect a barometer?

Answer 1

As you increase altitude pressure decrease.

Answer 2

The pressure of the atmosphere at any level is defined as the weight of the overlying column of air over unit area at that level.According to this definition,the atmospheric pressure changes with height.i.e., it decresaes as you go upward and increases as you go downward.

In a barometer,which is of mercury type,the weight of a column of mercury is made to balance the air pressure(or rather the weight of the air column of the atmosphere) over a mercury trough.

As the altitude changes, this length of the air column over a place changes (as explained above)and accordingly the length of the mercury column (inside a barometer)which balances this outside air column also changes.

Answer 3

barometers measure atmospheric pressure.  if you watch the weather reports on tv, they are alway  talking about low pressure system (which are associated with rain, storms, etc) and high pressure systems (which usually mean clear, calm, sunny days).

Since the earth's atmosphere gets thinner the higher up you go (as mountain climbers know), barometers will be affected by the altitude they are at.