Do soap bubbles last longer in cold or warm tempetures?
549625
That you can experience yourself. Do the test!
61030
u must keep the the solution in 37C incubator after adding SDS, so that the surfactant SDS wont make crystals it will take sm time but they will dissapear. but will reappear if u keep it at low temp....so before using transfer it to 37C
393819
Half cup Sunlight soap, half cup water and one teaspoon of glycenrine (you can get that at the drugstore, it keeps the bubbles from popping so fast).
638380
Heat will always travel from the warmer to the cooler. For example, an ice cube might be 32 degrees. If it is sitting in a room with an air temperature of 70 degrees, the heat in the air will travel into an ice cube until it melts completely. Once it melts, the water it was made of will continue to absorb the heat in the air until it is the same temperature as the air. The same occurs with oil in an engine, or any other object. Some things absorb or lose heat faster than others, and the more of a temperature difference there is, the faster the heat travels from the warmer object to the surrounding air, water, or whatever. An ice cube will melt much faster in boiling water than it will in cold water. Water will also freeze faster the colder the freezer is. I have proven this a number of times by putting room-temperature water bottles in various freezers. Some freeze in less than an hour, some freeze in several hours, depending on the freezer's temperature. Here's a conversion for Celsius and Fahrenheit.\n\nConvert Fahrenheit to Celsius F=1.8(C)+32\n\nConvert Celsius to Fahrenheit C=(F-32)/1.8 \n\nTo answer your other question, it has nothing to do with how many degrees per gallon of water in order to freeze it. What is important is that the air temperature is below freezing. The farther below freezing the air is, the faster the water will freeze. The more water there is, the longer it will take to freeze. The warmer the water is, the longer it will take to freeze. There are several variables. The volume of water, the temperature of the water, and the temperature of the air. It is the same for motor oil, or any other liquid. The rate of heat transfer is different for everything.
1118061
Warm water increases blood flow, and if you prefer cold showers the cold water is stimulating. Also the smell of the soap no matter how light is somewhat therapeutic. There's also the feeling of washing away problems,stress, anger, and all negative things down the drain.
185896
What I love is to soak in a bathtub filled with hot H20 on\na cold winter evening. Lots of bubbles!
27311
The normal freezing temperature for pure water is 0c.  However, as the additives are mixed in the pure water (in this case sugar), there will be a depression in freezing point (means lower than zero).  Ultimately it dependends on the sugar concentration in the water.  For an example, you can add few crystal in water and it will still freeze around 0c (slightly below unless you have accurate thermometer) vs sugary syrup that will require much lower temp.\n\nYou can llok up more of these in any Physical Chemistry book (mine is by author ATKINS) under "Depression in Freezing Point, Elevation in Boiling Point).
263044
when soap is mixed with water, it increases the surface tension so that when air bubbles get underneath, cant break through the increased surface tension.
786403
a) a lower freezing point than pure water
1139462
Yes that is why soap scum can build up on the ceiling of the bathroom, soap is made to bond with water if the bottle was not very tight and the soap got heated past 120 degrees F some leeching may occur.
221941
your breath is warm compared to cold temperatures
868477
water freezes at 32 degrees Fahrenheit, and 0 degrees Celsius\n\nthe colder the faster
704267
Depends on the glue.\n\nSome glues won't work in cold temperatures.\n\nSome glues won't work in hot temperatures.\n\nSuperglue works because it rearranges molecular structure of two items and fuses them together.\n\nYou need to go on a search engine and thoroughly investigate this if it's for a science fair.  I hope you didn't wait until the last minute, this will take at least two weeks to answer unless you can speed read and take copius notes quickly.  Then you'll need to do some mock-ups of actual experiementation.
335460
. Yes -- here is a general explanation for all you non-belivers.\n\nHot water can in fact freeze faster than cold water for a wide range of experimental conditions.  This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real.  It has been seen and studied in numerous experiments.  While this phenomenon has been known for centuries, and was described by Aristotle, Bacon, and Descartes [1-3], it was not introduced to the modern scientific community until 1969, by a Tanzanian high school student named Mpemba.  Both the early scientific history of this effect, and the story of Mpemba's rediscovery of it, are interesting in their own right -- Mpemba's story in particular provides a dramatic parable against making snap judgements about what is impossible.  This is described separately below.\n\nThe phenomenon that hot water may freeze faster than cold is often called the Mpemba effect.  Because, no doubt, most readers are extremely skeptical at this point, we should begin by stating precisely what we mean by the Mpemba effect.  We start with two containers of water, which are identical in shape, and which hold identical amounts of water.  The only difference between the two is that the water in one is at a higher (uniform) temperature than the water in the other.  Now we cool both containers, using the exact same cooling process for each container.  Under some conditions the initially warmer water will freeze first.  If this occurs, we have seen the Mpemba effect.  Of course, the initially warmer water will not freeze before the initially cooler water for all initial conditions.  If the hot water starts at 99.9° C, and the cold water at 0.01° C, then clearly under those circumstances, the initially cooler water will freeze first.  However, under some conditions the initially warmer water will freeze first -- if that happens, you have seen the Mpemba effect.  But you will not see the Mpemba effect for just any initial temperatures, container shapes, or cooling conditions.\n\nThis seems impossible, right? Many sharp readers may have already come up with a common proof that the Mpemba effect is impossible.  The proof usually goes something like this.  Say that the initially cooler water starts at 30° C and takes 10 minutes to freeze, while the initially warmer water starts out at 70° C.  Now the initially warmer water has to spend some time cooling to get to get down to 30° C, and after that, it's going to take 10 more minutes to freeze.  So since the initially warmer water has to do everything that the initially cooler water has to do, plus a little more, it will take at least a little longer, right? What can be wrong with this proof?\n\nWhat's wrong with this proof is that it implicitly assumes that the water is characterized solely by a single number -- the average temperature.  But if other factors besides the average temperature are important, then when the initially warmer water has cooled to an average temperature of 30° C, it may look very different than the initially cooler water (at a uniform 30° C) did at the start.  Why? Because the water may have changed when it cooled down from a uniform 70° C to an average 30° C.  It could have less mass, less dissolved gas, or convection currents producing a non-uniform temperature distribution.  Or it could have changed the environment around the container in the refrigerator.  All four of these changes are conceivably important, and each will be considered separately below.  So the impossibility proof given above doesn't work.  And in fact the Mpemba effect has been observed in a number of controlled experiments [5,7-14]\n\nIt is still not known exactly why this happens.  A number of possible explanations for the effect have been proposed, but so far the experiments do not show clearly which, if any, of the proposed mechanisms is the most important one.  While you will often hear confident claims that X
311960
Cold tap water is about 50 degrees.  Hot is limited to about 120 to prevent scalding.  100 is what you might consider "warm" water.  There's more distance between cold water temperature and warm (100-50=50 degrees difference) than between hot water and warm (120-100=20 degrees difference)  Just looking at the numbers, you'd have to add 2.5 times as much hot to warm up the cold than the other way around.  (This is the basic idea - a more complicated description would require that I break out my heat transfer book...)
319184
if the cold thing is cold and crystaline, like pyrex or ice, the object cracks because of rapid localised expansion.\n\nIf it is really really cold, the water will crystalise.\n\nIf cold water hits something hot it forms little drops with a protectice steam jacket and they bounce around for ages, a cool experiment for home on a hot frying pan. (only uses drops of water though)
62870
Cold Water. - Most of the time. \nI have tried and tested this before (Tap Water). The hot water normaly takes about 10 minutes longer. When using Tempratures like 30 degrees and 70 degrees this will begin to vary and warm water might start freezing faster than cold water. \n\nWarm water can in fact sometimes freeze faster than Cold water but it very much depends on the conditions.\n\nWhat you are thinking of is the Mpemba effect. This could be due to a number of factors including but not limited to Evaporation (less water needed to be freezed), Dissolved Gasses and Convection.\n\nFor a lengthy but thorough explanation see the link below.\n(Very reliable references) \nhttp://math.ucr.edu/home/baez/physics/General/hot_water.html