1. Atmospheric pressure (Gas pressure)

3. Air around us exists pressure on us
P(atm)= Pa
In all directions

4. Calculate the force acting on a man whose surface area approximately equals to 1,5 m2.

5. Answer=151,950 N

6. 15,000 Kilograms!!!!!

7. Why don’t we feel that force?????

8. Answer

11. Measurement of air pressure
Air pressure is measured by BAROMETER

12. The most known barometer is MERCURY barometer.
Toricceli invented this barometer.

15. 76 cm-Hg= At sea level

16. Every 105 m decreasing by 1 cm-Hg
When you rise, atmospheric pressure decreases
Every 105 m decreasing by 1 cm-Hg

17. A barometer indicates 30 cm-Hg pressure at a mountain
A barometer indicates 30 cm-Hg pressure at a mountain. Find the height of the mountain.
Pressure at sea level is 76cm-Hg

18. Answer : m

19. An airplane flies at height of 6120 m, what is the pressure at that height?
Find in mm-Hg and pascal.

20. Answer : 25cm-Hg.
32894,73 Pa.

21. Practice problems and tasks.
1. p Read
2.p 156 Solve Example 5.11
3. p 163 Solve the following problems 1 and 2