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does 1 ml = 1 gram?

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I seem to recall from like year 7 science that 100mls of water = 100g.

Now, is this true, have I remembered correctly, and does it also apply to other liquids? For instance, I have markers on my cups so I get between 100-150g of milk each morning.

Does this equal 100-150ml? Because I had to manually enter the nutritional information, and on the carton it's per 100ml, not 100g. So I just assumed 100ml would equal 100g...

*goes a little crazy* ;)
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No. mL is a measure of volume, and gr is a measure of weight. Look at this page: They show some conversions between volume and weight for some specific foods, so you can see that it is different for each food.
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maybe I'm looking in the wrong place but I don't see how to get from grams to ml. how the hell do I find out how much 100g of milk is in volume? :( this is so depressing!
You can not get from grams to ML without using a scale. They are 2 totally different types of measurements.  For example grab a liter of soda bottle and fill it up with lets say feathers.  Now grab the same bottle and fill it up with gravel or cement.  Both will be 1 liter but the first one might weight 5 grams while the second is mabye 500+ grams.  The only way to do it really is to research online for how much a cup of milk weighs.

1 cup = 236.5 ML and 1 cup of milk is 244g so 236.5ML/244g*100g = 97 ML is the same as 100g of milk.  So basically for milk 100ml = 100gram.
handy link

Edited to add: cause the volume is different this tools lets you choose the type (sometimes even the brand) of food you're converting.
in any case, the "m" in "ml" (milliliter) means 1/1000
Even if there was an exact correspondence between ml and grams, that would be mg (milligrams) not gram
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"maybe I'm looking in the wrong place but I don't see how to get from grams to ml. how the hell do I find out how much 100g of milk is in volume?"

You don't. It would be different for each substance. If you want to know the weight of a liquid in grams, put the cup on the food scale, reset it to zero, then fill the cup up. The conversion to grams for that particular liquid is whatever the scale says it is.
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Thanks terrier08, as long as it's roughly 1:1, that alleviates my fears ;) I just didn't want to be consuming twice as many calories as I was logging or something! (I don't think anyone else understood my question either lol)
The definition of a gram is one mL of water (which is also equal to one cubic centimeter of water). So unless the density of something is really different than that, it's fair to estimate that a gram is approximately the same as a mL. For example, obviously cereal weighs less than water so the conversion would be different, but for most juices, milk, etc., it's about the same.

Hope that clears up any confusion.
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Yes, that was what I was after :D I'm just weighing liquids here and of course the nutritional information panel on those has a standard of 100ml not 100g. So I wanted to make sure that I could manually enter those at per 100g...I know that 100g of feathers and 100g of ball-bearings, while having the same *mass*, will have very different volumes! I was only concerned with liquids.

And now I can pour milk on my breakfast without stressing that I'm inadvertently doubling my calories ;)

I know this is old but just to clear it all up...

1 gallon of milk is 3785.411 millilitre

1 gallon of milk weighs approximately 8.6 pounds

8.6 pounds is 3900.894 grams

so... (3900.894 grams / 3785.411 millilitres)*100 = 103.05

so... 100 ml of milk weighs 103.05 grams.

As some people have mentioned milk is slightly more dense than water so by volume it weighs a little more. But yes, it is roughly 1:1

Hope this helps some others now!

and make sure your gravitational measurements are accurate for determining weight too!lol

You're right! I didn't think to check that this was all on Earth! :-)

by way of further explanation, I know that an earlier poster did covert 100ml to grams but since values on milk are listed in 100ml I thought it would be easier for people to have the value in grams, just because this website only allows you to put in serving values in grams not ml.

this way you just have to type in 103.5 grams into the serving values rather than having to recalculate all the values on the packaging...

Well, that's what I did anyway and how I came across this thread.

it's not a perfect conversion for all liquids, but it's close enough.  even for water, it's only perfect at sea level.

For all watery liquids (water, juice, milk, vinegar, etc.) 1 g = 1 ml is close enough. 

For oils, the density is low enough (and the calories high enough) that you should factor it in if you're using a lot.  In general, 1 ml of oil weighs about 0.9 g.  So, 5 mL (1 teaspoon) is only 4.5 g.  Not a big deal.  But if you wanted to use 1 cup in baking, that's 250 mL but only 225 g.  If you weighed out 250 g, you'd be getting 225 more calories than you expected.

That said, when I'm entering new items on the site and I only know the volume, I enter that (in ml) in the spot for weight - 'cause what else am I going to put there?  :-)

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