why do objects move from high to low pressure?
110300
Bernoulli's equation relates pressure to the speed of a moving fluid.  That's entirely different to what the question here is.\n\nThe reason things move from high pressure to low pressure is because such a pressure gradient is statistically unstable.  The principle is so simple it's studid.  Think of a fluid as being a bunch of tiny particles, flying around and banging into one another.  At high pressure, the particles are packed closely together, and they will hit eachother more frequently than they will at low pressure.  Every time two particles collide, they are driven away from one another.  So if a particle hits a particle and bounces toward a place of greater pressure, it will be statistically very likely to hit another particle again in a big hurry.  If it bounces to a place of lower pressure, it will be statistically less likely to hit another particle in a hurry.  If you sum up all of the collisions, the result is that movement up a pressure gradient is less stable--that is, it lasts a short time--than movement down a pressure gradient.  The effect of this is that on average, you end up with a net flux of particles in the direction down the pressure gradient.\n\nThis sounds absurd, but it ultimately makes the flow occur.  You have to realize that particles move very, very fast, and collisions happen with a frequency we can barely imagine.  So imagine you're an air molecule in a soda can that's been shaken.  There's so much pressure, that any way you go, you hit another molecule almost instantly.  Suddenly the top is opened.  Those molecule that are closest to the opnening are at an extreme point in the pressure gradient: below them are crowded molecules, and above them are the more rarified atmospheric air molecules.  They bump about at random.  But if they're bumped down into the can, they go little distance before being bounced back.  If they're bumped up, they go much further before hitting another molecule.  This means that in the vacinity of the opening, the pressure is reduced, and there are less molecules in that area.  Now the pressure gradient has propagated into the can.  Those areas adjacent to that area near the opnening now experience the same effect--being bumped away from the openeing meets it with a quick collision, while being bumped toward the opening makes it able to travel further before hitting another molecule, because so many have left the can that the area near the opening is much less crowded.  This keeps happeneing until the pressure inside and outside the can is the same, due to a net flux of molecules out of the can, and it happens really, really fast.\n\n\nConservation of momentum also makes it so that in an elastic collision, the net momentum of the collision before and after a collision is unchanged.  So for fluid in a pipe, that means most collisions will keep everything going down the pressure gradient.
24462
Yes, it does. Pressure = Force/Area. So area is inversely proportional to pressure. So pressure does decrease with increase in area.
1163332
if u mean blow,,,\nwind blows because of the pressure difference between 2 places... it blows from a place of high pressure to that of low pressure....\nand i think this pressure difference may arise sometimes due to a temperature difference also
494151
It's bernoulli's principle. Fluids have a lower pressure when moving than when still. Since the water is moving past the spoons (which act like the wing of a plane) they feel a pull from the pressure drop and come together. Try it with a peice of paper sometime. Roll a piec of paper up so when you place it on a flat surface it looks like a curved bridge. then blow under it and it will collapse instead of blow away. It's pretty neet.
786817
Anywhere there is a difference in pressure. Examples:\nLow pressure in a vaccum cleaner, higher pressure outside pushes the air into the cleaner. Different pressure in a house compared to outside, when you open a window the higher pressure flows to the lower pressure. Remember that it is always a push and never a suck. Science never sucks!
1182741
This is due to two reasons:\n\nAt high altitude, the atmospheric pressure is much less than sea level, because gravity causes most of the atmosphere to settle towards the Earth.  In fact, over 50% of the atmosphere resides under the five mile mark above the Earth.  As a result, the air is less dense the higher you go.  \n\nNow it is true that the sun heats this air, but since there is less pressure, it expands as it rises much more easily than the air does near the Earth.  As a result of this expansion, the air cools.
806436
For the same reason that water goes down the plug hole in a vortex.  Air goes from high pressure to low pressure, but it goes round areas of low pressure in ever decreasing circles.
677782
It's the change in air pressure which causes it.
162429
As pressure increases, volume decreases.
1122613
You must already understand the displacement description so here's an attempt to physically understand the process.\n\nGravity pulls everything with mass  towards the center of the Earth.  This includes water and even air.  This is what creates air pressure and water pressure within a column of the fluid.  The force towards the center of the Earth is called the Weight.  Weight is simply the mass of an object multiplied by the acceleration of gravity (32.2 feet per second).\n\nMolecules in fluids can move around very easily.  They are constantly being pulled downward by gravity.  Generally, they are blocked by other fluid molecules already below them but they pile up and apply a pressure to the poor suckers below them.  The molecules at the bottom of the stack are under tremendous pressure in very deep portions of the ocean because they have to support the weight of the molecules above them.  (This also creates a sea level air pressure of 14.7 pounds per square inch)\n\nShips weigh less than the water they displace.  Gravity is pulling that ship down, trying to get it to the center of the Earth.  Once the weight of the water equals the weight of the ship, the water pushes back with enough force to keep it afloat.  Water molecules can flow easily.  When they begin to weigh more than the effective weight of the ship, they will flow beneath it and push the ship upward.
523715
Higher Velocity will cause lower pressure and larger volume that will decrease its temperature. Volume, temperature and pressure are all physically related in gas.
947575
It is possible for an object to be falling fast enough for the force of air resistance to exceed the force of weight and for the object to accelerate upwards until it slows to a speed at which the force of gravity equals the air resistance and the net force equals zero.\nHowever, this will not happen on its own.  You cannot drop an object from a tall building and expect to see it accelerate up and down as it falls.  As the object accelerates downward, its velocity increases, causing the force of air resistance to increase (meanwhile weight stays constant).  The object will approach an equilibrium point at which the air resistance equals the weight and the new force equals zero (speed at this point is called its "terminal velocity").  At this point, the object stops accelerating and travels at a constant velocity until the equilibrium is disturbed.  The object cannot cross this equilibrium point on its own...but for example, if you shot a bullet straight down out of a gun, the bullet might exit the gun barrel at a speed such that the drag force is greater than the weight, and the bullet slows down as it falls, approaching the equilibrium point.
929539
wind is caused by the movement of air from regions of high atmospheric pressure to regions of low atmospheric pressure.  high pressure is caused by the cooling of air: as air cools, it shrinks and becomes more dense and its pressure therefore increases.  low  pressure is caused by the heating of air: as air warms, it expands and becomes less dense and its pressure therefore decreases.\nrain is caused by the rising of columns of air: when a bubble of air is warmer than its surroundings, it expands and becomes less dense.  this less dense air rises, and as it rises, it gets cooler.  as it cools, it becomes less able to hold moisture.  eventually, you reach a point at which the air can no longer get any cooler without having to lose some moisture.  it is at this point that clouds and rain start to form.\nyou get storms if you have the right combination or rain, wind, air pressure, humidity, and clouds.
726645
A pressure drop is associated with stormy weather, while high pressure is seen with fair weather.  Air moves from areas of high pressure to areas of low pressure, so you can still have high winds in areas of high pressure, if low pressure is nearby.  The air carries moisture with it towards the low pressure, which is why storms and low pressure usually coincide.
820799
Weight. "An object goes as deep as the amount of mass it can move upwards", so that's why... the more salt, the heavier the water and less the egg can descend.
469524
It has to do with high and low pressure systems. Wind moves from high-pressure areas to low-pressure areas.
634368
Low pressure develops when pockets of warm air rise.\n\nHigh pressure develops when air sinks. It is literally pushing down.\n\nAir pressure in general changes due to elevation. The higher up you go, the less air. In turn, there is less air pressure. This is due to the forces of gravity.