What is an air pocket?How is it formed?
956275
an airpocket is better known as  turblulance. it is either a up draft or a down draft. it is better to find airpockets in the summer time.  if you are taking off in an airplane, as soon as the airplane is airborne  you may some times feel the airplane dip   toward the ground if you are over water  at low altitudes  nothing really changes. However if you are over trees radiation from the ground  will cause the plane  to give you the up or down feeling. as wind flows over the earth  it is give interference  with trees houses   anything really.  thunderstorms  create updartfts and downd drafts.  updraft  during the building stages. and downd dratfs  during the disappating stage.  so you would find a great deal oaf "airpockts"
964586
Try this link\n5. Operating instructions\n5.1. Paper size adjustment\nAfter the lateral paper guides (1) have been adjusted to the size of the paper being folded, the back stop (2)\nhas to be placed to the end of the paper pile. This avoids that the paper moves backwards because of the air\nblow. The achieve a maximum sheet separation, all air jets (4) outside the paper stack have to be closed\n(thus ensuring optimal air pressure under the stack)
1168038
First the diaphragm under the lung expands creating an area of low pressure in the lungs leading to the air from outside the body to rush into the mouth to the trachea to the bronchi to bronchi oles and then to alveoli. The lung is like a sponge and has an increasingly small system of tubes that are lined with microscopic alveoli that are lined with capillaries. When O2 molecules reach the alveoli they diffuse oppositely to carbon dioxide which is the body's waste gas. The blood cells go from the capillaries in the alveoli to venules to the pulmonary vein where it enters the left atrium and then goes to the left ventricle where it is rushed out of the heart through the aorta where it divides into other arteries, arterioles, and then capillaries.
11130
Wow, we are sitting at the bottom of a sort of "ocean of air".\n\nHere is one simple source for the newspaper ruler air pressure demonstration.\n\nJust search yahoo for "air pressure rule newspaper" for others.
650626
Sinking air creates high pressure because it is essentially pushing down on you. Low pressure is the opposite. It occurs when air is rising therefore it will not push down on you or exert any extra force.\n\nSinking air is associated w/ cooler air temperatures, that is, cooler than the air already in place.
456439
Air is heated & rises at the equator. The air is forced to about 30 degrees north & south of the equator at high altitude. It starts to cool at these latitudes and starts to descend. As it descends it is heated due to decreasing antitude and increasing atmospheric pressure. This causes the moisture content in the air to decrease resurlting in typically cloudless skies and little rain. This is called a 'Hadley Cell'.\n\nThese latitudes were called the horse latitudes becuase in the days of sailing ships which were often becalmed in these latitudes, sailors were forced to kill livestock on board ships to conserve water and provide food.
824709
even if the air isnt polluted, there is still carbon dioxide and water vapor in the air.  When carbon dioxide(CO2) and water(H2O) react in air, they form Carbonic Acid (H2CO3).  Since it is an acid, it is acidic
38059
Foam cups contain air pockets, and this makes them better insulators. Heat travels by conduction, convection or radiation. \n\n1. Conduction\n\nThe air pockets drastically reduce the heat transmission by conduction. Heat travels more easily through the ceramic by conduction than it does through the foam with the air pockets. \n\n2. Convection\n\nSince ceramic contains few if any interstices; so there is definitely less air in ceramic than there is in the foam. However, in both cases, the air pockets are very small, limiting the amount of heat that can be transmitting by conduction. \n\n3. Radiation\n\nInfrared radiation is probably passed more easily through ceramic than foam, especially given the color of most foam, which tends to make it quite reflective. \n\nA quick way to tell how insulating they are is to feel the foam and the ceramic with your hand, to determine which feels cool to the touch and which feels warm. The foam definitely feels warmer, since it reflects the heat back from your hand. The ceramic will likely feel cooler to the touch, and therefore it is not as good at insulating.
170260
Space is not a perfect vacuum devoid of particles, atoms, or molecules, it is a partial vacuum.  It is just that the density of matter in space is so small that it doesn't apply pressure against the balloon. If the balloon pops, the air inside the balloon is dispersed at the molecular and atomic level since air is comprised mostly of molecules: O2, CO2, CH4
981593
they come to the surface to get air also
483587
It is basically a u tube manometer.\n\nThe pressure of air in one side (air inside an air bag) of the u tube is measured by the excess of mercury level in the other tube.\n\nThe air bag is made to surround one’ arm and pressure of air inside the bag is increased by pumping air inside.\n\nBecause of high pressure the blood circulation below the arm stops.\n\nBy slowly releasing the pressure and noting the pressure at which circulation of blood starts is noted. This is the highest pressure and again at a lower pressure the pulse is noted this is the lowest pressure.\n\n Systole refers to the contraction of the heart and conventionally systolic arterial pressure is the highest pressure developed in arteries during the ventricular contraction of the cardiac cycle. Diastole refers to a relaxed heart muscle and diastolic pressure has conventionally meant the lowest arterial pressure during a heart cycle. The pulse pressure is related to the amount of blood being pumped per beat. It is the systolic minus the diastolic pressure.
227670
Lift is created as air passes over the upper and lower sides of the wings. The air splits at the front edge of the wing. The upper surface is curved, making it slightly longer than the lower surface of the wing. The air molecules separate at the leading edge (halftraveling over the top and half across the bottom of the wing) and meet again in approximatly the same position as they were before they separated. This spreads the molecules out slightly on the upper surface of the wing and forces them to travel faster, creating a vacuum between the molecules(low pressure). The air on the lower surfrace of the wing doesn't speed up or spread out since the surface is flat (on high lift wings). This creates a high pressure area across the lower side of the wing.\nSince there is low pressure on the upper surface and high pressure on the lower surface, the wing lifts.
491260
It's a large amount of air pushing through a small space. It's not the "buns" flapping. It happens at the point of exit. \n\nThere really isnt any more delicate way to put it.\n\nI cant believe I just answered this question. I need a life!
337412
The answer you are looking for is in the soil-plant-atmosphere continuum.  I'm too tired to give a full answer now so I will come back to this.\n\nIt basically works on negative pressure.  Air is the driest in the continuum and pulls water through the stomates from the xylem (not the phloem) up the stem from the roots, from the soil.\n\nI'll come back later.
64590
A pneumatic actuator is an air driven mechanical device for imparting motion to a component.  Look at a JCB and the pistons that power the digger arm.  These pistons fit into cylinders - these are examples of actuators (though in the case of the JCB they are hydraulic actuators).\n\nThe air pressure is supplied to one side of a piston, forcing the piston and connecting rod up a cylinder.  To reverse the action pressure is applied to the opposite side and the reverse occurs.\n\nActuators can also be rotary, these are sometimes termed air motors but are rotary actuators, the air drives a turbine which acts through gears to turn a threaded element, which engages with a thread on the driven component.  Some aircraft flaps are lowered and raised by pneumatic rotary actuaors.
1063614
It is not air that takes a spherical shape in water but rather the water forces it to take that shape. This is because of surface tension - the same reason why drops of water tend to be shperical. It is the state with least potential energy implying the most stable state.\nIn case of smoke in air, the same thing does not happen as neither air nor smoke does not have any surface tension (being gases, rather mixtures of gases, they are not cohesive unlike water or any liquid for that matter). The simply diffuse into each other randomly (and aided by air currents) however, smoke being a hot mixture of gases, tends to rise higher, hence the wierd upgoing patterns formed by smoke.
15792
It is that shape because it comes down a long shape tunnel and with pressure. So it is compress together.