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Well, after expressing the object in the European system, we should express the dimension of these objects.

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Dimension is very important in the technical field because everything needs to be done with a specific size.

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and size is important so express our dimension in the in the in the draw is the only way to

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to give enough information uh other people to do this to to make this object uh in this

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presentation we will review some important concepts such as scales,

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dimension lines, length units and dimension standardization. So let's move

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on to the first point which is scales. Obviously when we draw something we use

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proportionality. We use the Thales theorem and the dimensions of our draw are

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proportional to the dimension of the real object. But we have to express this

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and to express the proportionality we usually use scales. Scales may be natural

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scales when the draw and the object have the same dimensions and we

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express like this, with E and the dimensions in the draw and dimensions in

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the real object. But not only do we have the natural scale but we also have

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other types of scales, such as the reduction scales, which are the most

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important in technology. In this particular case, our draw is

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smaller than the real object, so we have to express the proportionality using

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this expression of scales. And finally we can also have scales of

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extension that just only used for biological, for example, to express

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bacteria or also in electronic or so on when in these fields in which the

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objects are very small and we need to to extend them in order to give the

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details of the objects. In our draw we have to express the dimensions of the

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real object. For this we use dimension lines. The elements of dimension lines

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depends obviously what you want to dimension but in the simplest in the

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easiest way in case you have a extension line it also calls auxiliary extension

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line and you draw a dimension line which is parallel to the dimension you want to dimension

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and this dimension line is ending in arrowhead this dimension line the thickness of this

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dimension line is 0.2 millimeters, which means that is a thin line. In the

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middle of this thin line, of this dimension line, you should express the

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real dimension of the object in millimeters without decimal and without

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the symbol of millimeters if you are drawing very big or very small object

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you also change millimeters and put in which units are in the dimension line

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have to express has to write has to express a the the unit that you have

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used to express dimension and in this is late we review the units of length it is

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the basic unit is meter obviously but what happened very often is that the

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objects are or too big or too small so we usually need to use a difference

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units or of lengths so you put profiles in order to express the value of the

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of the unit. The most important are kilo, which is 1000, hecto, which is 100, deca, which is 10,

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and when it's smaller, when it's small, we use deci, centi, and milli. But in this slide,

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you can see other possible for units of length. Finally, we use some standardization

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to express our dimensions line. For example, if the object has symmetry, you

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put the dimension line taking this into consideration. The dimension line

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never cross so be careful in this with this and finally the the cube the cube

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lines the cube dimensions if the cube dimension is bigger than 180 degrees you

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use the diameter for dimension this kind of objects. On the other hand

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if it's smaller you use the radius and sometimes you can put the symbols to

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express that is a diameter diameter of a radio and it is all for today but what is very important is

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that you you do the exercise because as you have said you have already said in in technology and

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and also in draw is very important that you train a lot.

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So the only way to learn all these contents is training.

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And it's the reason why you have to do the exercise.