How much faster will a very hot cup of tea/ coffee be cooled if you wrap your hands around it vs room temp?
84085
Yeah, Im pretty sure wrapping your hands around it wont affect it at all. And only a paper cup would be affected at all obviously.\n\nYour hands are generally room temperature, and even if they warmed up from holding the coffee, they would only be effecting a small amount of surface area of the coffee -ie the coffee on the side of the cup.
162771
I am the coolest of all English teachers! I am so cool, I can't have hot coffee because as soon as I touch my mug, it turns into a frappuccino! I don't need air conditioning in my classroom because as soon as I enter the room, the temperature drops down to a chilly 65 degrees! I AM THE COOLEST!
662532
Hot water will drop in temperature at a faster rate, but the cold water will freeze first except under certain circumstances in a phenomenon known as the Mpemba Effect\n\nhttp://math.ucr.edu/home/baez/physics/General/hot_water.html for more details on the phenomenon
30165
This really depends on what liquid versus what solid you are heating.  Some liquids are actually less heat conductive that solids.\n\nFor example,  if you have some oil and some aluminum then the aluminum is going to heat up faster than the oil would.
139477
matters how warm u are, and if you're hot, it melts in your hands
346348
The heat energy is transfered away from the hot coffee to the cooler surrounding by all three methods, \nconduction, convection, and radiation.\n\nHeat [energy] is conducted from the hot coffee to the surroundings (air, container, ...), in addition, small convection currents develop to help the conduction process take place.  In addition, energy is also lost through radiation.  The hot coffee also emits a small amount of  infra red radiation which is invisible to the naked eye, this radiation carries energy away from the coffee, gradually cooling it.
451840
Quite obviously faster. To boil over and turn to vapour, the water molecules near the surface need a lower amount of energy when the water is being boiled in a rarer atmosphere.
541181
See this answer.  Dig into the citations for the reference articles in them.  The second also has references.\n\nHot freezes faster in many cases, given certain controls such as same amount of water, same size and shape container, standard pressure etc.  There  is at least one experiment showing that water at 90 degrees C will freeze quicker than water at 18 degrees C.  This is significant since one side is quite close to boiling and the other is basically room temperature.\n\nIf you are not a high school student, I would look up linear programming ( a branch of algebra not computer science) and develop a sensitivity analysis to determine the impact of various effects.
473790
Bout 5 mins, if you slap your hands togethr an drink some nice hot tea.
31740
I would say that it would be very hard to tell an exact tempurature with bare hands because the temperature you seem to feal is relative to the tempurature of your hands. \nFor example, if you hands are warm, go run them under the pretty hot water on the tap. It feels pretty warm and comfortible. Now go bury your hands in the snow for a few minutes until they feel colder all te way through. Return to your warm water. The same tempurature of water seems to be quite hot! \nThe reason for this (I think) is because of nerve impulses. When there is a change in the temperature of your hand that is a large change, your nerves are disturbed, and send the impulse of heat to your brain. If you hand is already hot, than this change is miniscule, cause the nerves to have less of a reaction.\nI hope this helps.
1017824
Hot water will drop in temperature at a faster rate, but the cold water will freeze first except under certain circumstances in a phenomenon known as the Mpemba Effect\n\nhttp://math.ucr.edu/home/baez/physics/General/hot_water.html\nfor more details on the phenomenon
967249
Liquid nitrogen, even when it comes in contact something as warm as skin will almost instantly evaporate. If you were to dump a few tablespoons of liquid nitrogen onto room temperature carpet, it would even evaporate very quickly. The amount of liquid nitrogen needed to cool even a few cups of lava would be enormous. Lava has a temperature of several thousands of degrees, rather than the about 100 degrees of a human hand. Despire common belief, you can actually pour liquid nitrogen onto your hand, because it will eveaporate before it even touches your hand. The heat emmitted from your body will cause it to evaporate before it even touches it. The same thing will happen with lava, except at an even further distance. Almost no change in temperature could be noticed.
318279
Hot\n\n\nThe Mpemba Effect is a special phenomenon where hot water freezes faster than cold water. The discovery of this effect was made by a high school student named Mpemba in Tanzania, Africa in 1969. He noticed this phenomenon while making ice cream and was curious enough to make note of it. His teachers did not believe it was possible, and it took several years until university professors finally accepted his discovery.\n\n\nWhich Boils Faster??
214068
You can purchase Wolfgang Puck coffee, in self-heating cans, at the grocery store.  (Albertson's, Vons, etc.).\n\nYou push a button in the bottom of the can and the coffee is hot in 6-8 minutes.  Keep a couple in your car or desk!
353832
The answer depends on many variables, including:\n   - How hot is the hot water?\n   - How cold is the cold water?\n   - How cold is the freezing environment?\n   - What is the humidity in the freezing environment?\n   - Are the water containers covered or not?\n\nThere is a famous experiment in which boiling water in an uncovered container exposed to dry, barely-below-freezing air froze before a container of the same amount of room-temperature water in the same conditions.\n\nThis only happened because much of the hot water evaporated in the first few minutes, leaving a much smaller mass of water in the "hot water" container than in the "cold water" container.\n\nIt is not hard to show that a small mass loses heat faster than a large mass. So, ultimately, the "hot water" froze first.\n\nIf you run the same experiment with sealed containers, the cold water freezes faster because it has the same mass and less heat to lose before freezing.
811304
let thetemperature of the mix be 't'*Cfind the heat lost by coffee\nfind the heat gained by ice in three stages\na)from -2.2*C to 0*C\nb)for melting and becoming water at 0*C\nc)for getting to the equilibrium temperature of the mixture\nequate and solve
971595
remember a microwave heats the water molecules directly.  So it doesn't get much hotter than 100ºC as long as there's liquid water around.