in this video i will talk about the differences between heat and temperature heat and temperature refers to two different physical quantities the heat itself is the thermal energy and the energy transfers from one object to another object and as a result there is a change in temperature so the change the temperature changes because of the heat energy so remember the heat means the thermal energy and as there is a transfer of heat from one object to another object there is a change in the temperature okay so heat is always measured in energy which is the unit of which is measured in joule or in calorie so heat always transfers and as a result heat transfer there is a change in the the temperature so or in other words the way we define temperature is is the average kinetic energy of atoms or molecules of a system so for example if you have a gas the gas molecules and if you change the temperature what happens to the gas molecule it starts vibrating more vigorously so that means the that if it starts vibrating more rapidly that means the temperature has increased so you know the the higher the temperature means the molecules or the atoms inside that system is vibrating more rapidly the higher the amplitude or the faster the molecules are moving inside a system that means it does have a higher temperature okay the heat transfer from one object to another object only because of the difference in the temperature okay if there is no temperature difference then the heat may not transfer it will not be transferred heat transfer only when there is a difference in the the temperature it is the heat that are transferred and as a result there is a change in the temperature so here i have made a some diagram just to show you the similarity between the water flow and the heat flow because it is easy to conceptualize visualize the water flow and then if you understand how does the water flow then you should be able to translate that energy to the heat energy or you should be able to understand how does the heat flow so here i have two the different vessels here this is empty and in this facial a i have the water filled here and this is it this was closed here this tap here so once i open the tab what happens the water will flow from a vessel to b version and why is that the water flow from high pressure to low pressure in other words it are on the same level then from the higher height to the lower height because the pressure is directly proportional to rho gh so from a higher height to lower height remember the water flows from higher height to lower height and it continues to flow from a higher level to lower level till the level difference is zero if there is no difference in the level then the water flowing stop but as far as there is a difference in the height level is for if there is a difference in the high level then the water will continue to flow okay and remember now so once the water has flown the volume of these two could be entirely different and i'll talk about that one so as i mentioned here the water flows from higher level to from higher height to a lower height exactly the same thing happens to the heat flow the heat flows only from a higher temperature to lower temperature so here i have two bodies body a and body b so here the red means this is thermometer here is showing its high temperature and this is at low temperature and when i place them in physical contact to each other then what happens the heat transfer and the direction in which the heat flow will be from higher temperature to lower temperature which is exactly equal to the higher height to the lower height and it will continue to flow till the temperature difference is zero that means both becomes exactly at the same temperature and in this case it becomes exactly at the same height so there's a very very similarity between how does the water flow and how does the heat flow the water flow from higher pressure or you can call from a higher height to a lower height and it will continue to flow till the till there is no height difference and heat will continue to flow until there is no temperature difference so here are the some points i have written down water flows from higher pressure to low pressure or from higher height to lower height and heat flows from higher temperature to lower temperature water keeps flowing from higher pressure to lower pressure until the pressure difference is zero or a high difference in zero the same thing i mentioned already heat keeps flowing from higher temperature to lower temperature until the temperature difference is zero the other thing the volume of the water that is flown the or the volume of water lost from from vessel a is exactly the volume of water gained by the vessel b so if you look at from the the volume of the water here this much volume that much volume has to be in the vessel b or the volume of water lost by vessel a is exactly equal to the volume of water gained by facial b okay the volume of water lost by vessel a is exactly equal to the volume of water gained by vessel v what does that mean again this volume is exactly equal to the heat so heat loss when object a is equal to heat gained by object b so in this case here what is happening here when you have a hot body and a cold body when you place them in contact with each other the heat flows from body a to body b are from hotter to colder and the amount of feed lost by the hot body is exactly equal to the amount of heat gained by the cold body so there is a much similarity okay so always remember the if it loses 20 joule of energy then this one must again the 20 joule of energy that what it exactly says heat lost by object a is heat gained by object b and there is another important point here water flow is independent of the volume of the water in the facial it only depends upon the pressure or height difference so what does what is this mean so again what is it say here the water flow is independent of the volume so in this case here you have certain volume if you had a bigger vessel here but height is same then the this object would could again float till the height difference is zero okay so it does not depend upon the how much volume you have it only depends upon what is the height difference between the the two vessels it doesn't depend upon the volume difference it only depends upon the height difference the same thing happens to the transfer of heat the amount of heat transfer does not depend upon how much heat you have it only depends what is the uh the temperature difference okay and again the heat continue to transfer only until the temperature difference becomes exactly equal so hope i'm i'm hopeful that the that similarity between the water flow and the heat flow will be useful to understand the flow of heat and this is it from this heat and temperature lecture again if you have any questions write down your questions in the comment section below and do not forget to like 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