what is an example of an adiabatic process?
551062
An example of this is when the air is released from a pneumatic tire; the outlet air will be noticably cooler than the tire, and after all the air has escaped the valve stem will be cold to the touch. Diesel engines rely on adiabatic heating during their compression stroke to reach the high temperatures needed to ignite the fuel. Such temperature changes can be quantified using the ideal gas law.
174163
thermodynamics?  heat transfer?  physics?
269267
The statement is that no cyclic process is possible that does nothing but transfer heat from a cold body to a hot one. In my understanding the key words are "nothing but". To keep a heat pump system working energy (work) needs to be added. In practical heat pumps gas (refrigerant) is compressed, condensed, expanded and evaporated. In compression is where energy is added.\n\nYou can also think of a heat pump as an air conditioned system to cool your neighborhood, just be aware that this "image" has its limitations when you are designing the real thing.
20960
Many chemical reactions release energy in the form of heat, light, or sound. These are exothermic reactions. Exothermic reactions may occur spontaneously and result in higher randomness or entropy (ÄS > 0) of the system. They are denoted by a negative heat flow (heat is lost to the surroundings) and decrease in enthalpy (ÄH < 0). In the lab, exothermic reactions produce heat or may even be explosive. \nThere are other chemical reactions that must absorb energy in order to proceed. These are endothermic reactions. Endothermic reactions cannot occur spontaneously. Work must be done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured during the reaction. Endothermic reactions are characterized by positive heat flow (into the reaction) and an increase in enthalpy (+ÄH). \n\nExamples of Endothermic and Exothermic Processes \n\nPhotosynthesis is an example of an endothermic chemical reaction. \nIn this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction requires 15MJ of energy (sunlight) for every kilogram of glucose that is produced: \nsunlight + 6CO2(g) + H2O(l) = C6H12O6(aq) + 6O2(g) \n\nAn example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. This reaction produces 411 kJ of energy for each mole of salt that is produced:\n\nNa(s) + 0.5Cl2(s) = NaCl(s) \n\nEndothermic reactions take in energy from their surroundings\n\nDissolution of salt is endothermic because it takes energy from its surroundings not much but some.\n\nAs far as all salt types that is hard to say and you would have to do an experiment to find that out.
89089
Besides the typical methods such as refrigeration which uses expanding freon or amonia gas to transfer heat or standard evaporation, two other electro-mechanical methods come to mind.\n\nOne method is a thermoelectric cooler which can heat or cool based on the direction of DC electric current flow. It is built from a junction of two metals which are different and when DC current passes through the junction, heating or cooling can occur depending on the direction of the flow of the DC current. This is known as the Peltier effect.\n\nThe second totally mechanical method is known as a Vortex seperator. Air is introduced at high speed into a tube with a curving vane inside. As the air spins up through the tube, the colder air, which is heavier is forced outside due to centrifical force while the air moving up the center is warmer and lighter than the cold air. The difference in the weights of the cold and warm air cause them to seperate from each other with the cold air unable to make the tight turns and is forced to the outside of the tube as it spins to the top. These units typically have a cold air output connection on the outside of the tube at the end and a warm air connection in the center of the tube at the end.
855397
Not sure what you mean... \nAn example of simple diffusion is that of steroid hormones which diffuse readily through the cell mebrane and reach their target molecules within the cell.\n\nFacilitated diffusion you have for example for the uptake of many hydrophilic/charged nutrients from the blood. The concentration of the nutrient is higher on the outside of the cell, yet it cannot simply diffuse through the membrane; it needs the help of transport proteins.\n\nActive transport means that the cell needs to import something uphill its gradient, using energy. The most profound example is the Na+/K+  ATPase which pumps Na+ out of the cell and K+ into the cell using ATP (both Na+ export and K+ import are uphill processes).\n\nA beautiful combination of passive and active transport is seen in the intenstinal epithelial cells. The concentration of glucose in the gut is lower than inside the cell. So the human body needs to consume energy and actively import glucose. This happens via a symporter that imports Na+ together with glucose. The import of Na+ is downhill so it releases energy which is used for the uptake of glucose. Once the glucose is inside the epithelial cell it will be passively exported to go to to the bloodstream.
259675
A rough example as follows:\n\nQuestion: What happens to ICE when you PLACE IT IN WARM WATER?\n\nHypothesis: IT TURNS INTO LIQUID.\n\nMaterials: ICE, CONTAINER, WARM WATER.\n\nSteps: 1.  FILL CONTAINER HALF WAY WITH WARM WATER.\n       2.  PLACE ICE IN CONTAINER.\n\nObservations:  I OBSERVED THE ICE MELT.  THE ICE TRANSFORMED FROM A SOLID TO A LIQUID.\n\nConclusion: ICE A SOLID CAN TRANSFORM INTO WATER A LIQUID WITH THE ASSISTANCE OF INCREASED TEMPERATURE.
42550
Potential, kinetic, chemical, electrical, and thermal.
755151
Silver tarnishing.\nBurning natural gas for cooking.\nCharcoal grill (burning charcoal).\nBleaching an ink or grass stain from clothing.\nCopper pipes turning "green."\nCooking (think of boiling an egg).\nExploding gasoline vapor in an automobile engine.\nLighting a cigarette lighter (propane burning).\nA burning candle (paraffin or wax).\nPaper or leaves decomposing.\nElectricity production from the chemicals in a battery.\nBread dough rising.\nFermentation of wine or beer.\nToast burning.\nMaking caramel.\nMixing Jello.\nTreating hard water to remove minerals.\nAcid rain dissolving limestone.\nOzone production by an electrical spark or lightening.\nOxygenation of exhaust gases by a catalytic converter on a car.\nBaking a cake.\nMaking pickles.\njust to name a few.
874053
First, the non-simple words.  This is one example of a principle of thermodynamics.  The state of a system will be that with the lowest Gibbs Energy.\n\nIf you mix 2 parts hydrogen gas and one part oxygen gas and trigger the reaction with a spark, they will combust to form water, releasing energy in the process.  That's because the water molecule has a lower energy level than the isolated atoms.\n\nIn classical mechanics, it started out as an empirical observation that nature is lazy.  Light travelling from one point to another takes a specific path because any other path would be a longer one.  Deducing the path this way is a minimization problem.  You write a system of equations for all the ways the path could vary.  Then you solve that system for a minimum of its energy function.  The Hamilton and Lagrangian formulations are ways of specifying laws of physics (mechanics) so that these mathematical methods can be used for finding solutions.
251198
id say reactions can occur at any temperature above 0k. so 0.00000000000000000000000000000001K, the reaction would happen but really really really really relaly slowly. but thatz in theory. i have no clue bout pracitcally. i think the lowest temp theyve got to so far is either 4K or 0.6K. so ya.
832550
Bernoulli's principle can be tried.\nLaws of forces can be demonstrated.\nThermodynamics-transfer of heat.....etc
1157378
If you mean the generation of ammonia, it is called the haber process:\n\nN2 + 3H2 > 3NH3\n\nNitrogen + Hydrogen > Ammonia\n\nIt is a reversible process requiring high temperatures and pressures.
607425
Yes, provided the conditions are right. For example if the reaction\n\nA + B -> c + d\n\nis exothermic, the reaction in reverse will be endothermic, i.e. you will have to supply the heat.
832834
d)\notherwise some of work transforms to heat which is potential energy not kinetic.\nfor example when you kick the wall, acting forces are not elastic and do not rise kinetic energy of your feet or wall.
1150361
adiabatic means no heat transfer but does necessarily not imply isenthalpic.  An adiabatic compression process would still raise the enthalpy of the working fluid since mechanical work is being done on the fluid.
435509
An Endo-Thermic reaction takes in heat and the Exo-thermic one gives off heat.\n\nExemples:\n\nExothermic processes         \nmaking ice cubes              \nrusting iron                  \n\nEndothermic processes \nmelting ice cubes \ncooking an egg