Download presentation
Presentation is loading. Please wait.
Published byMelvyn Burns Modified over 9 years ago
3
General idea: The column of air exerts a force on the surface of the earth. This force per area is as large as 1.03x10 5 Pa at sea level, also known as the atmospheric pressure. Approximately the same pressure that an elephant bull weighing (7000 kg) approx. 70.0kN exerts on a 1.5 square meters of area.
6
It is not safe to dive at a great depth under water because you will be crushed by the weight of water above you. That’s why the material for the construction of submarines has to be secured thick and strong or else it would be crushed like a tin can under your feet.
7
Pressure Basic: the amount of force per unit of area. A B c
8
Which exerts greater pressure on the surface? B A C
9
B A C
10
B A C
11
Gauge vs. Absolute Pressure Absolute Pressure Zero referenced to a perfect vacuum. Gauge Pressure Zero referenced to ambient pressure
12
Where is there greatest pressure? A B C D
13
Pascal’s Principle on Hydrostatic pressure Pressure exerted on a confined fluid is transmitted undiminished to all parts of the fluid and walls of its container Also called as Pascal’s Law or Pascal’s Principle of Transmission of Fluid Pressure
14
Where is there greatest pressure? A B C D
15
Other applications of Pascal’s Law Hydraulic lift
16
Which exerts greater pressure on the surface? ABC ALCOHOLWATERMERCURY
17
What is the total pressure at the bottom? C MERCURY A B WATER ALCOHOL
18
Lecture Point Find the gauge and absolute pressure on the points indicated. (Illustration is given on the board)
19
Exercises What downward force exerted on a small piston of radius 2.00 cm would lift a 2.00 x 10 3 kg car, if the radius of the large piston is 12.0 cm?
20
Exercises The maximum gauge pressure that the components of a hydraulic lift can withstand is 15 times the normal atmospheric pressure. If the diameter of its output piston is 32.0 cm what is the maximum mass it can lift?
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.