Atmospheric pressure at point A is 790mm, at point B is 810mm. Determine the absolute and relative heights of the two points.

When rising, the atmospheric pressure decreases by 1 mm Hg for every 10 m.
Atmospheric pressure at sea level = 760mm Hg

Point B relative height:
1.810mm – 790mm = 20mm – pressure difference
2.20mm * 10m = 200m – difference in height

Point A relative altitude:
1.790mm – 810mm = -20mm – pressure difference
2. -20mm * 10m = -200m – difference in height

Point B absolute height:
1.810mm-760mm = 50mm – pressure difference
2 50mm * 10m = 500 m – point height

The absolute height of point A:
1.790mm – 760mm = 30mm – pressure difference
2.30mm * 10m = 300 m – point height