A small quinity of water is boiled in a can; the can is capped off and cooled; the can collapses. why?
139052
Water vapour occupies much more space than liquid water. When you boil the water a lot of it vapurises, the water vapour pushes a lot of air out of the can. When you seal the can no more air can get back in to replace it. As the water vapour cools it turns back into liquid water. With no air to replace it the pressure in the can drops- a lot. The pressure of the air outside the can of course is the same. With very little air inside pushing out and normal pressure outside pushing in the air crushes the can.
97391
When you have fluids and acids in a can (especially soda, since soda has many acids in it), and so forth...when all the pressure expands in the can... it bursts, because there is no room for it to expand any longer.. \n\nGood luck!! \n\nMichelle -- not too good at science..hope this helps! LOL..\nHFA; higher-functioning Autism, Bipolar Disorder, and ADHD.
885093
If the inside is pressurized, the shape has to symmetrical in such a way, that will make the internal pressure distribute itself more or less equally. Else the can may burst where the pressure is more.\nAlso the shape has to have a logical design.\nFor the sake of argument, let us consider others shapes.\n\nSpherical:: well that's not possible. Not very easy to hold !!\nBut yeah, from the physics point of view, its the ideal.\n\nCube and Cuboid :: The corners present can cause unequal pressure distribution, also the strain present may give rise to corrosion.\n\nElliptical:: no comments !!
597803
D) It's heat of fusion is higher than its heat of vaporization.\n\nWater's heat of fusion is: 334.5 kJ/kg\nWater's heat of vaporization is: 2256 kJ/kg\n\n\nE IS NOT CORRECT BECAUSE: Water is denser than ice. If water was not denser than ice, ice would not float.\n\nAnd Mr. the_bendude, you must have never taken chemistry. Heat is not the same as temperature. Yes, water boils at 100C and freezes at 0C, but that does not mean those are the heats for which it does.
2167
You can't make water boil by compressing it directly.  If you compress it, but allow the hest caused by compressing to leave, then you'll get nothing.  It is possible if you have an insulated system to compress it in such a way that temperature of the water rises, but at higher pressures, the temperature needed to boil water increases.  If the water, once heated by comprsession, were to be rapidy brought to a lower pressure through a throttling valve, it could be vaporized.\n\nBut really, if you want water to boil, you should *DECREASE* the pressure.  In out space, water at room temperature would instantly boil due to the low pressure involved.
1048745
When water is boiling under heat source, the heat is so intense that the water does not get a chance to condense in order to create fumes.  But, if the heat source is turned off, some water can condense due to loss or lack of heat creating appearance of steam fumes.
968042
Boiling is vapour pressure phenomenon. A liquid always exerts a pressure in the space just above it due to evaporation of its surface molecule which is called vapor pressure of that particular liquid and as temperature is raised the vapour pressure goes on increasing. When vapor pressure of the liquid exceeds atmospheric pressure liquid starts to boil.\nin case of a mixture, the solute molecules bind the molecules of the solvent and thus there are fewer surface molecule available to evaporate from the liquid surface. Due to which vapour pressure exerted by a mixture is always less than vapor pressure of pure solvent. To make vapor pressure of mixture to reach the atmospheric pressure level its temperature should be raised more than temperature of solvent alone. Thats why a mixutre has a boiling point elevation.
487982
I'd say physics rather than chemistry.  When you squeeze a bottle full of water containing a gas-filled "diver", the water is not compressed.  Only the gas in the diver compresses causing the diver to displace less water.  The cartesian diver is carefully made to be just barely buoyant, so when compressed its reduced displacement causes it to sink.
134246
The Latent heat of Fusion and Latent heat of Vaporization refer to how much energy must be put into a substance (or taken out) in order to change its phase after it has reached its melting/boiling points respectively.\n\nTake water for example [boiling point 100 C, melting point 0 C].\nWhen you are boiling water, the temperature continues to increase until it seems to stop at 100 degrees C.  At this point, water begins to boil and until all the water has boiled off, the temperature will remain constant.  However, obviously, energy is still being put into the system (that is what is causing it to boil) but you dont see a temperature increase.  This enegry is going directly into boiling water, not increasing its temperature, thus it is somewhat "hidden".\n\nNow take water freezong into ice.  As water is cooled dowbn, its temperature will decrease until it reaches 0 degrees C.  At this point water is still a liquid, but is on the verge of becoming ice.  In order to make that liquid water into solid ice, additional energy need to be taken out of it, the Latent heat of fusion.  All the while, as the water freezes, its temperature stays a constant 0 degrees C, it will not continue to decrease until the watrer is frozen.
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.
164163
Evaporation is vaporization of a liquid below its boiling point.
269454
The gas is turned into liquid by compressing it and well mixed up with water. When we shake the soda it turns back to gas and hence needs more room than it has.
794147
You might work up some Q&A while showing this old demo of the effect of atm pressure...thereby adding some visual interest to the subject.\n\nAdd a few oz of water to a square-sided, metal, one-gallon can having a tightly fitted cap...bring to a vigorous boil (cap now off, please :-))..) and continue boiling until all air is expelled...screw cap in place and allow to cool...they will see the can collapse.\n\nWork up questions about the vacuum thus created (by the condensation of the water vapor) allowing atm pressure to exert its force.
103211
because the pressue of the air in the bottle decreased
1052162
On paper that has to be the answer but there is a concept of heat loss when boiling water comes in contact with cold water.\nThe loss is in the nature of steam. \nSteam is at a the temperature of boiling water. \nSo there is a loss of heat. The cold water ends up being less in quantity due to steam loss. \nSo the cold water cannot offset the heat of the boiling water, so the temperture will be higher than that of 50 Degrees.
383320
the idea isn't that water can't heat up when it boils at low pressure, but that it doesn't have to. no matter what temperature something is, its molecules are moving somewhat, and some of them escape as a gas. also, any gas always is condensing into a liquid or solid. when pressure and tempurature are constant, these processes reach equilibrium where they cancel each other out. at high temperature, more gasses escape, and at low pressure, less gases return to liquid. so at somewhat low temperature and relativly lower pressure, even though few gases relatively escape, even fewer return to liquid, so the net effect is that the liquid evaporates at low temperature. if the temperature were raised, it would boil even faster.
745608
liquid...at 0 C it would be frozen and at 100 C it would be gas, since 75 is not yet boiling, the water would still be liquid