On the first floor of the school building, the barometer shows a pressure of 755 mm.

On the first floor of the school building, the barometer shows a pressure of 755 mm. rt. Art. and on the roof 753 mm. rt. Art. Determine the height of the building.

First, you need to determine the pressure difference in the barometer at the top of the building and at its base.

We subtract less from high pressure.

We get:

755 – 753 = 2 mm Hg

Find the height of the building.

To do this, we multiply the found pressure difference by 10.5 meters, since the pressure changes by 1 mm Hg every 10.5 meters.

As a result, we get:

2 * 10.5 = 21 m.

Answer: The height of the building is 21 meters.