Exploring gas pressure The pressure of the atmosphere is not the same in all places it varies with height High up a mountain the atmospheric pressure is much lower than at sea level In space there is no atmosphere and so there is no pressure ID: 199934
Download Presentation The PPT/PDF document "Aseel Samaro" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Aseel Samaro
Exploring gas pressureSlide2
The pressure of the atmosphere is not the same in all places – it varies with height.
High up a mountain the atmospheric pressure is much lower than at sea level.
In space there is no atmosphere and so there is no pressure.
IntroductionSlide3
The atmosphere contains molecules of oxygen, nitrogen and carbon dioxide as well as of other gases.
The force of gravity pulls all these particles towards the Earth.
This causes the atmosphere to press down on the Earth and everything on it.
The pressing down is called
atmospheric pressure.
Explaining pressure in the atmosphereSlide4
The particles in the air are constantly moving and they do not lie in a compact layer on the Earth’s surface.
The higher you go from the Earth’s surface, the more space there is between the particles.Slide5
Variation of atmospheric
pressure with height
What challenges does
mountaineering present?Slide6
What causes the atmosphere to have pressure?
Suggest why there is no atmosphere in outer space.
What might limit the height that a hot-air balloon can go to?Slide7
What causes the atmosphere to have pressure?
T
he weight of gas particles pulled towards Earth by gravity
Suggest why there is no atmosphere in outer space.
Gas particles are attracted to massive objects in space because of gravity; so between the massive objects there are few particles.
What might limit the height that a hot-air balloon can go to?
At
high altitude the balloon will expand and burst; because the atmospheric pressure is so lowSlide8
Nearly all organisms depend on a readily available supply of oxygen so that they can release energy during respiration.
This energy is essential for all life processes.
At high altitude
the body struggles to take in enough oxygen to function properly and even gentle movement can be exhausting.
Climbing mountainsSlide9
The part of Mount Everest above 8000 m has become known as the ‘death zone’.
At this height, there is about one-third of the oxygen available at sea level.
In addition to this, extreme terrain, cold and wind add to the dangers. Mountaineers spend weeks
acclimatising
at high altitude before attempting to go to the summit.They aim to spend as little time as possible in the ‘death zone’ and they often carry cylinders of oxygen to breathe from.Slide10
Draw particle diagrams to compare the air at the top of Everest with that at sea level.
Suggest some problems a mountaineer using bottled oxygen may meet.
Suggest how a climber’s body could
acclimatise
to breathing at high altitude.Slide11
Draw particle diagrams to compare the air at the top of Everest with that at sea level.
Diagrams
should show approximately three times as many particles per unit volume at sea level
Suggest some problems a mountaineer using bottled oxygen may meet.
Extra weight to carry; expensive; difficulty obtaining supplies
Suggest how a climber’s body could
acclimatise
to breathing at high altitude.
M
ore
red blood cells might be produced; lung capacity might increase; heart might become bigger/stronger – all linked to increasing ability to deliver oxygen to body cellsSlide12
Predicting the weather is a complex process that involves
modelling
the atmosphere using computers.Data about air pressure, temperature, water
vapour
and winds throughout the world’s atmosphere are used.Did you know
…?Slide13
Thank you