PRESSURE - GR9 by Lizelle Swanepoel https://padlet.com/lizellexs/rb33tahxvxig7xh0 en-us 2021-08-31 19:20:48 UTC 2025-08-06 08:59:58 UTC hello@padlet.com PASCAL'S PRINCIPLE states: Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container. lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707913354 2021-08-31 19:22:08 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707913354 WHAT IS PRESSURE? lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707921434 DEFINTION:
Pressure is force per unit area.

FORMULA:
P = F/A

UNITS:
P = Pressure in Pascal (symbol Pa)
F = Force in Newtons (symbol N)
A = Area in meters squared (symbol m2)]]> 2021-08-31 19:25:27 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707921434 Worksheet 2 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707980150 2021-08-31 20:03:12 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707980150 Worksheet 1 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707983300 2021-08-31 20:05:26 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707983300 PRESSURE IN LIQUIDS lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707988129 2021-08-31 20:08:22 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707988129 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707996757 2021-08-31 20:14:30 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1707996757 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708004525 2021-08-31 20:18:49 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708004525 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708005320 2021-08-31 20:19:23 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708005320 Pressure increases with depth lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708015591 2021-08-31 20:25:47 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708015591 PASCAL'S PRINCIPLE DEFINITION AND EXPLANATION lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708037000 2021-08-31 20:41:28 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708037000 PASCAL'S PRINCIPLE - APPLICATIONS lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708038412 2021-08-31 20:42:34 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708038412 NOTES lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708045665 2021-08-31 20:48:25 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708045665 PASCAL'S PRINCIPLE - EXERCISE lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708050082 2021-08-31 20:51:36 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708050082 PRESSURE IN GASES lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708059407
Gases exert a pressure because the gas particles exert a force when they bounce off objects. 
 
 
 Both cylinders have the same number of particles in - and both sets of particles are going the same speed. Particles in the small cylinder hit the walls more frequently as there is less distance for the particles to cross from the top to the bottom of the cylinder. More collisions means more pressure so the pressure is higher in the small container.

]]> 2021-08-31 20:59:09 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708059407 HOW A BOURDON PRESSURE GAUGE WORKS lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708076001 2021-08-31 21:13:46 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708076001 PARTS OF THE BOURDON GAUGE lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708078171 2021-08-31 21:15:41 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708078171 MANOMETER lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708080399 A manometer is an instrument that uses a column of liquid to measure pressure.  It cannot be used for very high pressures – a bourdon gauge is needed

Patm = Atmospheric pressure- value is given

Ph = Pressure due to liquid in the column
Ph = ρ x g x h

]]> 2021-08-31 21:17:36 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708080399 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708083187 Atmospheric Pressure

The pressure the air exerts at the surface of the Earth (at sea level) is about 101 325 Pa. 
Our bodies have evolved to cope with that pressure, or we would be squashed.

Atmospheric Pressure is measured using a barometer – there are 2 main types: 
  • Mercury barometer 
  • Aneroid barometer

]]> 2021-08-31 21:20:06 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708083187 Mercury Barometer lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708083411
  • A glass tube about 1 meter high, one end open and the other end sealed. 
  • tube is filled with mercury and sits upside down in a container which also contains mercury. 
  • the mercury level in the glass tube falls, creating a vacuum at the top. 
  • The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure. 
  • If the weight of mercury is less than the atmospheric pressure, the mercury level in the glass tube rises. 
  • If the weight of mercury is more than the atmospheric pressure, the mercury level falls.    
    • ]]>     2021-08-31 21:20:19 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708083411     PRESSURE IN GASES AND MM MERCURY lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708094971 2021-08-31 21:30:13 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708094971 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708098721 2021-08-31 21:33:44 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708098721 MERCURY BAROMETER VS ANEROID BAROMETER lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708104309 Aneroid Barometer 
    - has a vacuum chamber that expands or contracts with changes in air pressure. 
    - expansion/contraction causes a series of levers to pull on a chain that is connected to a spindle 
    - The spindle turns and moves the needle attached to it on the dial, showing the air pressure  ]]>     2021-08-31 21:38:52 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708104309     PARTS OF AN ANEROID BAROMETER lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708105924 2021-08-31 21:40:23 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708105924 HOMEWORK - END OF CHAPTER WORKSHEET lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708109350 2021-08-31 21:43:11 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708109350 The atm and mm Hg lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708111477 2021-08-31 21:44:59 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708111477 CAN CRUSHING WITH AIR (refer to video earlier) lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708118641 2021-08-31 21:50:49 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708118641 APPLICATIONS OF AIR PRESSURE lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708119349 2021-08-31 21:51:27 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708119349 CONSERVATION OF ENERGY THROUGH THE BERNOULLI EFFECT lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708119747 2021-08-31 21:51:47 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708119747 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708120600 2021-08-31 21:52:43 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708120600 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708120923 2021-08-31 21:53:03 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708120923 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708134624 2021-08-31 22:05:25 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1708134624 CAN-CRUSH WITH AIR PRESSURE lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1724754130 2021-09-08 12:58:34 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1724754130 CENTRE OF LIFT lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1734085608 2021-09-12 19:05:11 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1734085608 LIFT EXPLAINED lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1734087011 Aërodynamic lift]]> 2021-09-12 19:06:43 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/1734087011 WHO WINS: HYDRAULIC PRESS OR STEEL BALL? lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2273666420 2022-08-28 07:03:01 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2273666420 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654300696 2023-08-01 17:50:33 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654300696 TITAN IMPLOSION DUE TO PRESSURE GRADIENT lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654308300 2023-08-01 18:06:58 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654308300 BARREL IMPLODING UNDER AIR lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654338464 2023-08-01 19:27:21 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/2654338464 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3057414024 2024-07-19 10:49:17 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3057414024 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3057414253 2024-07-19 10:50:02 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3057414253 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3067186404 2024-08-04 20:15:42 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3067186404 Coke + Mentos🚀 lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3262096567 2024-12-16 08:42:07 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3262096567 PRESSURE AND THE MAGNUS EFFECT lizellexs https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3448165475 2025-05-13 08:23:20 UTC https://padlet.com/lizellexs/rb33tahxvxig7xh0/wish/3448165475