definition of latent heat of vapourisation?
819353
The amount of heat required to change 1Kg of liquid into gaseous state is known as latent of heat of vapourisation
475093
see dear ,\nwhile calculating the energy changes we need to know the hidden heat { latent heat } that is absorbed during the change in state . for eg when we are calculating the heat absorbed or given out during a change in state , like ice to water , just first calculate the latent heat ie \nq=mL{ heat=mass *latent heat } now add this value to \nq=mct{heat=mass*specific heat*change in temp} keep in mind that specific heat is a constant value \nwater's specific heat is 4180j/kg/degree Celsius.
846365
Thermal energy IS heat.
129713
MeghnarMajhi is right.\n\nTemperature <==> Heat
1165215
Yes, this is called latent heat. The best example of this, is if you are boiling water at atmospheric pressure at sea level. If you placed a thermometer in this steadily heating water the temp would rise in a fairly uniform manner to about 96 degrees celsius, where upon it would seem to get stuck. The reason being, the heat energy is being used up to change the state of matter of the liquid water to steam. Until this transition is complete there will be no change in sensible heat as measured at the thermometer. Jules, lecturer. Australia.
227415
actual pressure of the vapour\ndivided by\nthe maximum pressure of the vapour at 'that' temperature\nequals (in this case) 1 = 100%
824019
As explained by previous responders, condensation is the reverse of vaporisation. However it is important to realise that vaporisation is the transition to a gaseous state and condensation is the transition from a gaseous state. \n\nThere are substances and conditions where a liquid state never occurs. For example carbon dioxide (dry ice) at one atmosphere of pressure passes from solid to gas without becoming a liquid. This is still called vaporisation. It passes from gas to solid without becoming a liquid and this is still called condensation. By far the more common transition is from and to a liquid state.
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the abscense (sp?) or presence of heat
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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.
246402
Latent heat of vaporization of water is 2260 kJ.kg-1.\nConverting 50g to kg = 50/1000= 0.05kg\n\nTherefore 2260 KJ/KG x 0.05KG = 113 KJ or Kilojoules or 113,000 J or Joules is your answer
293178
Cooling in the refrigerator. Drying clothes the vapor pressure changes exponentially. Populations and growth. (bugs, bacteria) Anything that grows in proportion to the amount.
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Evaporation is one of the two forms of vaporization. It is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. It is the opposite process of condensation.\n\nThe thermal motion of a molecule of liquid must be sufficient to overcome the surface tension and evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow rates between the gaseous and liquid phase and in liquids with lower surface tension (i.e. higher vapor pressure). Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. This phenomenon is also called evaporative cooling. This is the reason that evaporating sweat cools the human body.\n\nGas has less order than liquid or solid matter, and thus the entropy of the system is increased, which always requires energy input. This means that the enthalpy change for evaporation (ΔHevaporation) is always positive. Evaporation is a cooling process.\n\nEvaporation is a critical component of the water cycle, which is responsible for clouds and rain. Solar energy drives evaporation of water from oceans, lakes, moisture in the soil, and other sources of water. In hydrology, evaporation and transpiration (which involves evaporation within plant stomata) are collectively termed evapotranspiration.\n\nEvaporation is one of the two forms of vaporization. It is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. It is the opposite process of condensation.\n\nThe thermal motion of a molecule of liquid must be sufficient to overcome the surface tension and evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow rates between the gaseous and liquid phase and in liquids with lower surface tension (i.e. higher vapor pressure). Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. This phenomenon is also called evaporative cooling. This is the reason that evaporating sweat cools the human body.\n\nGas has less order than liquid or solid matter, and thus the entropy of the system is increased, which always requires energy input. This means that the enthalpy change for evaporation (ΔHevaporation) is always positive. Evaporation is a cooling process.\n\nEvaporation is a critical component of the water cycle, which is responsible for clouds and rain. Solar energy drives evaporation of water from oceans, lakes, moisture in the soil, and other sources of water. In hydrology, evaporation and transpiration (which involves evaporation within plant stomata) are collectively termed evapotranspiration.
363447
this re minds me of a kind of heat called latent heat.this is the heat a subtance requires to change it state without changing it temperature,so water changes from liquid to steam at the same temperatutre if it assumes it latent heat of vapourization.thus water could be liquid at 100*c and also steam at the same temperature.
174163
thermodynamics?  heat transfer?  physics?
196696
One possibility is fractional distillation.  This procedure takes the boiling points of each component of a mixture into account.  The mixture is connected to the proper apparatus and placed over heat.  That component with the lower boiling point will evaporate off first and can be collected in a recovery flask.  That material with a higher boiling point will evaporate latest.
228133
Basically to slow the reaction.  if you need more then here you go.\nsimply put heat is the measure of kinetic energy experianced by a substance either  molecularly or macrobiologically. the more abscence of heat means lower levels of energetic vibrations.  abosulte zero is a reflection of molecular stillnes.  if a reaction needs needs energy of some sort the the more energy delivered can increase the product of the reaction . look up la Chantiers principle.  by decreasing the energy level (activation energy) you there by decrease the rate of reaction (K) for a simplistic analogy, why do you but your food in thr refrigerator?  If i had $.50 cents yoou could buy a cupf coffee.  Read your Chem text.
575202
heat is a form of energy.