Why sudden expansion of a compressed gas causes cooling(usually expanded through a small nozzle)?
930130
I will look at it from a different angle.\nConsider the equation of state,\nPV=MRT\nExpansion through a nozzle causes the\npressure to drop and volume to increase \nbut not as compared to drop in pressre. \nThe net effect is that product PV reduces.\nM the mass is not changing. R is the gas \nconstant. So T[temp in absolute] has to drop.
927571
Any explosion is a rapid expansion of gas..the volume in the engine cylinder is at a minimum when this occurs,and the only release is the downwards force on the piston, which is the expanding driving force...
891922
Basically solids and liquids are not compressible because the molecules are so close together. A gas can be compressed because the molecules are far apart. Since there is still room betwen the molecules in a gas until it forms a liquid, there is space for absorbing impact. The molecules can get closer upon impact.
103211
because the pressue of the air in the bottle decreased
667559
First off it isn't air in your can.  What you probably have is either propane or butane in the can.  It is a liquid under very high pressure.  However, when it loses its pressure, it expands rapidly, and for it to expand rapidly, it needs HEAT, so it pulls heat from its surroudings to expand.  The absence of heat is cold, so that is why the can freezes up.\n\nThe same principle works in an airconditioner.  The compressor, squeezes the freon gas so it becomes a liquid and gives up heat (outside unit called a condenser blows out hot air).  The liquid freon then travels to an expansion valve or capillary tube where the compressor that is squeezing the freon into liquid is also sucking gaseous freon in on the suction side.  So there is low pressure on the suction side.  The liquid freon from the expansion valve or capillary tube enters this low pressure area and expands rapidly.  As it does, it draws heat to expand, thus pulling the heat from your home and cooling the air.
788371
Air has pressure, much like any gas.  By using this pressure it fills in cracks and crevices.
804765
Because it's less dense. Temperature affects density. And the less dense a gas is, the lighter it becomes, so to speak. Therefore it rises over cold air.
368950
It's the extreme pressure of the carbonation trying to force itself out of a small opening.  It's like when you hold your thumb over the end of a garden hose, it makes the spray harder because the pressure is backed up in the hose.  If you had a big enough opening, it wouldn't spew everywhere.
1055669
Outside the house you have a condenser unit with a compressor.  The compressor compresses freon gas and that makes it hot.  The condensor then removes the heat and turns the freon into liquid.  That is why the outside unit blows out hot air.  The liquid freon then goes to the evaporator inside the house.  In the evaporator, there is a thing called the thermostatic expansion valve or some capillary tubes (very small).  The liquid freon discharges through the TEV or capillary tubes and when it does, it expands in the presence of the suction from the compressor to form a gas.  As it forms a gas it draws heat from its surroundings to do that.  That is why the evaporator gets cold.  The cold freon gas is then sucked through the coils in the evaporator where it draws heat from the air coming across them back into the compressor, where the compressor compresses the cold gas and it gets hot again, and the cycle repeats itself over and over as the unit runs!
803295
The most plausible answer is 3.\n\n- As air expands, it does cool.\n- Cooler air is able to hold less water, so is saturated far quicker.\n- When air is saturated, water droplets will condense out of the air on many available surfaces, including on lenses.
468900
the compressor is used to compress cold air to be used in the cooling process of a/c. you lose very little coolant in the production of a/c.it takes the humidity out of the surrounding air and that is why we see the outside of the a/c drip water. that is the water or humidity that has been taken out of our environment
155067
The liquid molecules begin to heat up which causes them to increase their moleculer movement. They eventually move very far apart which causes them to be in the "gas" state.
330911
A system cooled by liquid nitrogen
283659
Because the bottle is not really empty, it is filled with air.  The air expands when it is heated because the molecules move faster, bump against each other, and require more space.
271092
as the temp goes up the molecules of gas move faster and collide more often with more energy into the balloon increaseing pressure and expanding the balloon.  As it cools the opposite happens.  Draw your own diagram!
634831
because den u are decreasin d volume taken up the gas molecules and so as in boyle's law d air presure wud increase causinin d molecules 2 push on d balloon wall harder and so it bursts
474309
to reduce air pressure sudden surge