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# integration... watch

1. i no something can be integrated in 2-dimension by order of integration but some time ago i attendted a lecture which i belive were integrating in 3-dimension and i would like to no what that is called or isit just still order of integration but in 3-dimension..
i belive they were working out volume of water if a pipe was to get jammed or something hope that helps..
2. Are you thinking of multiple integration? Like if you had or something. Or are you thinking of volumes of revolution, where you rotate a 2D shape around an axis?
3. Order of integration can always be changed with multiple integrals - you just need to remember to change the limits appropriately (where a sketch is almost always necessary!). Saying that you can change the order doesn't necessarily mean it will solve easily just because you change the order...
4. (Original post by sahil112)
i no something can be integrated in 2-dimension by order of integration but some time ago i attendted a lecture which i belive were integrating in 3-dimension and i would like to no what that is called or isit just still order of integration but in 3-dimension..
i belive they were working out volume of water if a pipe was to get jammed or something hope that helps..
You don't just have to use two integrals to solve problems , the same methods can generalise to integrating over three variables.As nota bene said , it's always possible to switch the order around to make your life a bit easier.

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