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Thread: SI-enhet

  1. #1 SI-enhet 
    Forum Masters Degree thyristor's Avatar
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    Hi!
    I don't really understand why mole is a SI-unit. I mean, it's just a number, it has no dimension.

    Edit: I meant "unit", not "enhet" (which is the Swedish word for unit (temporary confusion))


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    • #2 Re: SI-enhet 
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      Quote Originally Posted by thyristor
      Hi!
      I don't really understand why mole is a SI-unit. I mean, it's just a number, it has no dimension.
      Imagine a length, right? it has 2 dimensions, length and amount.

      Amount is a dimension see?


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    • #3 Re: SI-enhet 
      Forum Masters Degree thyristor's Avatar
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      Quote Originally Posted by LeavingQuietly
      Quote Originally Posted by thyristor
      Hi!
      I don't really understand why mole is a SI-unit. I mean, it's just a number, it has no dimension.
      Imagine a length, right? it has 2 dimensions, length and amount.

      Amount is a dimension see?
      I'm afraid I don't quite see what you mean.
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    • #4 Re: SI-enhet 
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      Quote Originally Posted by thyristor
      Quote Originally Posted by LeavingQuietly
      Quote Originally Posted by thyristor
      Hi!
      I don't really understand why mole is a SI-unit. I mean, it's just a number, it has no dimension.
      Imagine a length, right? it has 2 dimensions, length and amount.

      Amount is a dimension see?
      I'm afraid I don't quite see what you mean.
      Imagine that you had 0 lengths. Why, that has 0 dimensions.

      So why did the length loose 2 dimensions when it just lost an amount?

      Imagine now that you decreased the length to 0. how many dimensions are there now?

      1, since the amount of the 0 long length is still one.

      Need to discuss this more?
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    • #5 Re: SI-enhet 
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      Quote Originally Posted by thyristor
      Hi!
      I don't really understand why mole is a SI-unit. I mean, it's just a number, it has no dimension.

      Edit: I meant "unit", not "enhet" (which is the Swedish word for unit (temporary confusion))
      because there is a difference between a gram-mole and a kilogram-mole, for instance

      It is not just a number. Avagadro's number is a number.
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