BMP085

Data sheet

Bosch Sensortec

Rev. 1.2

Page 14

15 October 2009

© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such

as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Specifications are subject to change without notice.

-1000

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

Barometric pressure [hPa]

Altitude in standard

atmosphere

3.6 Calculating absolute altitude

meters can be calculated with the international barometric formula:

Thus, a pressure change of ∆p = 1hPa corresponds to 8.43m at sea level

3.7 Calculating pressure at sea level

With the measured pressure p and the absolute altitude the pressure at sea level can be

calculated:

Thus, a difference in altitude of ∆altitude = 10m corresponds to 1.2hPa pressure change at sea

level.

255

.

5

0

44330

altitude

-

1

p

p













=

































=

5.255

1

0

p

p

-

1

*

44330

altitude