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Offlinerunnerup
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Registered: 03/23/04
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does density always have to be (g/cm3) ?
    #3664542 - 01/22/05 11:06 PM (11 years, 10 months ago)

Since 1 mL = 1 cm3, is it improper to define it also as (g/mL)


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OfflineCatalysis
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Registered: 04/23/02
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Re: does density always have to be (g/cm3) ? [Re: runnerup]
    #3664745 - 01/22/05 11:44 PM (11 years, 10 months ago)

Typically I see solids represented as g/cm3 and liquids represented as g/mL. So actually its probably more common to see density expressed as g/mL but if your teacher/professor wants g/cm3 than you should use those units.


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Offlinerunnerup
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Re: does density always have to be (g/cm3) ? [Re: Catalysis]
    #3665046 - 01/23/05 12:33 AM (11 years, 10 months ago)

thanks for the answer man


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Offlinedaba
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Re: does density always have to be (g/cm3) ? [Re: runnerup]
    #3665301 - 01/23/05 01:09 AM (11 years, 10 months ago)

p = m/V, where p is density, m is mass, and V is volume.

So you can define density in any unit style (SI, MKS, FPS) as long as it obeys the formula above.


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OfflineRandolph_Carter
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Re: does density always have to be (g/cm3) ? [Re: daba]
    #3665314 - 01/23/05 01:12 AM (11 years, 10 months ago)

And who said you weren't learnin nuthin?


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"..all those molecules thrashing their kinky little tails, hot for destiny and the street."  Gibson


Nuke baby seals for Jesus!

(This has been a +1 production.)


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Offlinedaba
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Re: does density always have to be (g/cm3) ? [Re: Randolph_Carter]
    #3665319 - 01/23/05 01:12 AM (11 years, 10 months ago)

Not me?


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InvisibleLetto
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Registered: 12/13/02
Posts: 2,321
Re: does density always have to be (g/cm3) ? [Re: runnerup]
    #3668116 - 01/23/05 04:23 PM (11 years, 10 months ago)

If you are using strict SI units and going by proper convention, then your volume should be in m^3. The liter is technically not an SI unit, but it is widely used and accepted. Also, there shouldn't be prefixes in the denominator, so 1 g / mL would be 1 g / cm^3 = 10^6 g / m^3 or 1 Mg / m^3, or just 1 kg / L if you're using liters.

But most instructors and universities don't require such strict "grammar" with units. If you're professor doesn't say that he requires them, it should be fine to use liters or prefixes in the denominator. I think the only time following the convention perfectly would be in publishing articles.


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Offlinephi1618
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Registered: 02/14/04
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Re: does density always have to be (g/cm3) ? [Re: runnerup]
    #3668418 - 01/23/05 05:26 PM (11 years, 10 months ago)

You should report density in units of knot fortnight per hectare foot.


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