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Since when are mL's a unit of weight?

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Old Mar 11, 2007, 4:36 pm
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Question Since when are mL's a unit of weight?

I ran by a CVS today to pick up some shaving gel, as the stuff I had at home was too large to pass the Kip's Zip muster.

I noticed one brand--Gilette, I believe--that came in a fairly small can. It was labeled "NET WEIGHT: 100mL / 3.4 oz."

I almost laughed out loud in the store. First, this is the WORST example I've ever seen of confusing weight and volumetric measurements; usually, the confusion is on the oz / fl oz end of things, not the mL end! Second, it's uber-convenient, it would seem, that the "weights" match the current TSA guidelines.

I also noticed that my normal travel shave gel, in the exact same size can I already have but which says "Net weight: 5.6 oz" or something like that (which is why I left it at home!) now says, "Net weight: 3.4 oz"

Seems like people are manufacturers are doing all they can to capitalize on Kip's Folly.
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Old Mar 11, 2007, 5:59 pm
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Old Mar 11, 2007, 9:34 pm
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Duh. 1 mL of H2 has the same mass as 1 mL of iron filings.
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Old Mar 11, 2007, 10:29 pm
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Originally Posted by rar indeed
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Duh. 1 mL of H2 has the same mass as 1 mL of iron filings.
That would be volume, duh.
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Old Mar 11, 2007, 11:11 pm
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Originally Posted by carpboy
Originally Posted by rar indeed
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Duh. 1 mL of H2 has the same mass as 1 mL of iron filings.
That would be volume, duh.
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Old Mar 12, 2007, 7:26 am
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Old Mar 12, 2007, 9:15 am
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Originally Posted by rar indeed
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Duh. 1 mL of H2 has the same mass as 1 mL of iron filings.
Originally Posted by carpboy
That would be volume, duh.
Mass of 1 ml of H2 depends on the pressure. Volume of a gas, such as H2 is not a meaningful quantity unless pressure and temperature are also given.
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Old Mar 12, 2007, 12:14 pm
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Originally Posted by Yaatri
Mass of 1 ml of H2 depends on the pressure. Volume of a gas, such as H2 is not a meaningful quantity unless pressure and temperature are also given.
You only need to know density. Pressure and temperature have influence over density, but the measurement needed is density.
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Old Mar 12, 2007, 3:26 pm
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which weighs more... a ton of feathrs or a ton of bowling balls ask your favorite TSA agent that...
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Old Mar 12, 2007, 3:28 pm
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Originally Posted by mwarden
You only need to know density. Pressure and temperature have influence over density, but the measurement needed is density.
Correct, but do you know densities of agses at various pressures and temperatures?
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Old Mar 12, 2007, 3:32 pm
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Wink

I'm surprised in all this discussion nobody thought about using grams as a unit of weight, thusly -- milligrams or mg.

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Old Mar 12, 2007, 3:34 pm
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OP has a good point. For water at atmospheric pressure 1 mL = 1 gram, but mL is never a measurement of weight.
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Old Mar 12, 2007, 3:39 pm
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Originally Posted by osxanalyst
OP has a good point. For water at atmospheric pressure 1 mL = 1 gram, but mL is never a measurement of weight.
Strictly speaking, neither are Kg, g or mg.
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Old Mar 12, 2007, 3:42 pm
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Although technically, grams are a unit of mass. Newtons are the unit of force. ^

The imperial units of mass are either the slug or lbm (pounds mass).
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Old Mar 12, 2007, 3:55 pm
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Originally Posted by exerda
I also noticed that my normal travel shave gel, in the exact same size can I already have but which says "Net weight: 5.6 oz" or something like that (which is why I left it at home!) now says, "Net weight: 3.4 oz"
Presumably, that's so even the most stupid liquid barker can tell. Like the guy at JFK who told people to throw away their liquids because they weren't labelled, so he "couldn't see what they weigh."

No, I'm not making this up.
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