how does the gas on top of the liquid in an aerosole can cause the liquid to come out of the spray nozzle?
93225
The gas is under pressure, so when you press the nozzel the liquid ....mmmmmm better a picture than words..\n\n http://www.aerosol.com/
44675
For starters, these bubbles are not coming from the oxygen present in H2O, or any transition from gas to liquid state. The amount of activation energy it would take to break the H2O bond (plus the surrounding hydrogen bonds) to send liquid Oxygen to gas form is not going to come from room temperature. More likely, the gas bubbles you see are dissolved air. Your water has gone through many filtration stops and a multitude of meshes, all of which can dissolve small microscopic bubbles of air in the water. These either come out to the water-air interface or combine with neighboring bubbles (I would guess this reduces surface tension). You see the larger air bubbles.
116754
In a bottle of softdrink carbonic gas is filled under pressure. So you get the bubbles when you open it. The pressure decreases in the bottle when you open it and so the volume increases.\nIt's due to Volume to Pressure's Inverse Proportionality.
271065
When in the bottle or can the solution is in equilibrium with the partial pressure of C02 equal to the pressure in the can. When the can is opened the pressure in the can drops (the ffffft or hiss sound you hear) and now the partial pressure of C02 in the soda solution is greater than the atmospheric pressure. This results in C02 coming out of solution, which causes bubbles to form. The bubbles represent a separate phase, which is a heterogeneous mixture rather than the homogeneous mixture prior to opening.\nNote that the CO2 levels does not completely equilibrate upon opening. Once the solution has come nearly to equilibrium (re CO2), the soda is said to have 'gone flat' and is no longer fizzy.\n\nI'm not sure the presence of oxygen has anything to do with this phenomenon.
421576
Here's an interesting article that explains a little about how surface tension works in droplets.\n\n\n"Surface Tension in Water Droplets \nIntermolecular forces create the surface tension that causes these water droplets on leaves to bead up and form the smallest surface possible. The water molecules at the surface are pulled in by the cohesive force between themselves and molecules inside the droplet. The water keeps its droplet shape because there are no water molecules outside the surface to balance this inward pull. "\n\nhttp://encarta.msn.com/media_461560536_761563983_-1_1/Surface_Tension_in_Water_Droplets.html\n\nHere's another resource,\nhttp://en.wikipedia.org/wiki/Surface_tension
656135
When the atmospheric gasses interact their are collissions of gas and great "tornadoes' between the interacting substances.  this draws the moisture out of the air and the tornadoe funnels this moisture to the top of the tornadoe where it freezes and comes down as hail. i hope this answer makes sense i am a meteorologist and not used to wording these things in nongeek terms
295182
I suspect you are speaking of a contrail. There are two sources.\n\n1. The exhaust of a jet engine is very hot and can hold a great deal of moisture as it cools however the moisture condenses out and produces a "cloud"\n\n2. As a jet passes through the air areas of high and low pressure are created as these areas created or normalise a condenstaion cloud can be produced.
925494
you're forcing the CO2 out of solution all at once.  because it can only exit through a small opening it seems explosive
470974
The can and the air inside it expand. The can doesnt expand much, but the air does and a bunch of it flows out. When the can is placed in the cold water the can contracts really quickly and because there is less air pushing back on the walls it crunches up. There is nothing really big happening chemically.
278542
Actually, charging the nozzle of the CAN does NOT make IT use less paint.  However, LESS paint is used for  the JOB, e.g. spray-painting a car. But charging the nozzle of the CAN is only half of the equation; the object being sprayed MUST also be charged with the OPPOSITE charge. \n\nLet us say that the car to be painted is positively charged.  Then the nozzle will be negatively charged.  As the tiny droplets are forced out of the nozzle, they pick up negative charges which will cause them to be attracted to the car.  More paint will therefore adhere to the car.  Hence, less paint for the job. Without the charging, lots of pain is blown away due to air pressure. \n\nIncidentally, the paint will be more evenly distributed since the negatively-charged droplets will keep a more or less equal distance from one another before they touch the car.  This will give a better finish.
30270
In general, a gas turns into a liquid by cooling it.
74643
Convection leads to upward air movement, which in turn cools down the air. Cool air can hold less humidity, so a plume of mist forms where the formerly warm air gets cooled down. The droplets have a tendency to sink down but are moved up again by the convection which created them, thereby concentrating in one volume.\n\nStrong wind currents won't blow them apart but carry them along. What breaks up a cloud are irregular currents, or obstacles.
956501
Air, being in solution, is lost all the time at the top of the glass of water and nobody is aware of it.  Air particles by the same effect tend to break away from the water body at the glass sides and bottom.  Contrary to the top, there is a glass barrier, and air particles simply cluster together as small bubbles.  These bubbles of course become bigger with time and some become big enough to break away and float up to the surface.  This effect is much more apparent if you heat the water lightly as the air in solution expands.
1020028
Actually, this can happen with any dense material, not just mentos.   Like the twisted tab of the can of coke...\n\nYou see, soda is a supersaturated solution of CO2 in water.  That means, there is way more CO2 in the water than there should be at the given surrounding temperature.  This is achieved by forcing the CO2 under high pressure.  Anyway, a supersaturated solution is unstable and is prone to destabilize with the acting of external forces... like a dense material sinking to the bottom of the solution.  This results in the eruption of excess CO2 into gaseous form.\n\nThis has worked for me a lot.   Take a standard 300 mL bottle of Coke.  Open the bottle, and quickly twist the bottle cap (to make it denser and to allow it to fit through the bottle neck), then plunge it into the bottle.  And , fooosh!!  You'll get your eruption.  Take note that you have to do all this quickly, because if you don't the gas in the bottle will escape pretty quick and the above phenomenon won't be observed.
98511
true\nwater is a liquid. we all know that energy increases as we increase randomness. so when any liquid is converted to gas its energy increases as its randomness increases.\n\nthis increase in energy has to be supplied from outside. so when the floor is hot it has heat energy which can be used to convert the water from liquid to gaseous state.\n\nso when u spray some water it quickly evaporates utilizing the heat energy and as the heat energy reduces the room becomes cooler.\n\nthis is applicable to only the places which do not have moisture in the air otherwise there will be no evaporation and u will feel suffocation.
694162
nothing, the air is probably underneath the fluid and the position change will reverse that allowing the air to escape.
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.