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µm to mm?

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    hey

    AQA A Biology: how do you convert µm to mm? this is specifically for questions which require you to work out the scale of drawings and magnifications.

    thanks.xx
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    µm are x10-6m
    mm are x10-4m

    So there are 100µm in 1mm. Therefore divide by 100 to go from µm to mm
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    (Original post by corkskrew)
    µm are x10-6m
    mm are x10-4m

    So there are 100µm in 1mm. Therefore divide by 100 to go from µm to mm
    mm are x10-3m

    Making 1000µm in a mm.
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    (Original post by corkskrew)
    µm are x10-6m
    mm are x10-4m

    So there are 100µm in 1mm. Therefore divide by 100 to go from µm to mm
    No ... 10^-3 mm in a metre .... so divide by 1000 not 100
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    lol

    You know, the conversions from mm, µm, etc are actually harder in biology than physics! I kid you not.

    Stupid, eh?

    -Kavanne
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    Just remember - mille- means thousandth (like French).

    Oldak.
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    1e-6 -->> 1e-3
    multiply by 1000 not divide
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    (Original post by DaveManUK)
    1e-6 -->> 1e-3
    multiply by 1000 not divide
    No,
    If I'm converting 100µm --> mm
    you divide by 1000, to give 0.1mm
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    i find it easier to work in standard form, same difference.
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    hey then wht bout nm? coz there was this question in nm :
    find the magnification where the length of drawing is 4mm and the length of the specimen object is 1nm?
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    mm = 1.0 x 10-3m
    um = 1.0 x 10-6m
    nm = 1.0 x 10-9m

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    (Original post by corkskrew)
    µm are x10-6m
    mm are x10-4m

    So there are 100µm in 1mm. Therefore divide by 100 to go from µm to mm

    Apologies all. Friends 18th last night. Heavy head this morning. Won't happen again. Promise.
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    (Original post by corkskrew)
    Apologies all. Friends 18th last night. Heavy head this morning. Won't happen again. Promise.
    Lol - everyone makes mistakes - don't worry about it. As long as you don't go out to a friend's 18th the night before an exam that is!
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    ok guys just to clear things up a bit....

    how many nm would be in 4.2 mm
    and
    how many nm would be in 2.3um

    thanks in advance

    wacko_demon
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    (Original post by wacko_demon)
    ok guys just to clear things up a bit....

    how many nm would be in 4.2 mm
    and
    how many nm would be in 2.3um

    thanks in advance

    wacko_demon
    4.2 mm = 4 200 000 nm

    2.3 um = 2300 nm
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    can u please include working out ???

    wacko_demon
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    how many nm would be in 4.2 mm
    =
    4.2 x 106nm

    and

    how many nm would be in 2.3um =
    2.3 x 103nm

    You'r welcome
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    (Original post by wacko_demon)
    can u please include working out ???

    wacko_demon
    Right

    units go: (biggest to smallest)

    metres
    mm
    um
    nm

    to move up by one of those units (ie move up the list), you divide by 1000 because the unit becomes bigger so you have less of them
    To move down the list, multiply by 1000 (smaller units - more of them)

    so 4.2 mm --> nm
    moving down by 2 units so multiply by 1000 twice

    gives you 4200 x 1000 = 4 200 000

    similarly 2.3 um ---> nm
    moving down by 1 unit so multiply by 1000

    gives you 2300 nm
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    THANKS ALOT GUYS

    wacko_DEMON
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    Y m to Y mm = Y m x 1000 mm

    Y mm to Y um = Y mm x 1000 um

    Y mm to Y nm = Y mm x (1000 x 1000) nm

    Y nm to Y um = Ynm / 1000 um

    etc...
Updated: June 5, 2005
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