9 4. Explain how the two types of barometers measure atmospheric pressure. Mercurial Barometer: Atmospheric pressure pushes on the well at the base of the barometer. This holds the level of the mercury in the tube at a height indicating the air pressure.
12 4. Explain how the two types of barometers measure atmospheric pressure. Aneroid Barometer: Atmospheric pressure pushes in on the side of a sealed metal container causing the sides of the container to bulge in or out, moving the pointer on a scale showing the air pressure.
16 6. Compare the four main layers of the atmosphere. Troposphere: lowest layer, weather happens here, highest pressureStratosphere: second layer, contains the ozone layer, gets warmer as you go upMesosphere: coldest layer, meteors burn up here, gets colder as you go upThermosphere: hottest layer, ionosphere is here so auroras happen here, hottest layer, lowest air pressure (near zero)
18 7. Identify the two atmospheric layers that contain air as warm as 250 C? The troposphere and the thermosphere
19 Temperature Ranges of Layers 25o C25o CThermosphereTroposphere
20 8. Why is atmospheric pressure generally lower beneath a mass of warm air than beneath a mass of cold air?Molecules move farther apart when they are heated, so there are fewer particles in a given area to exert pressure.