It is 250 grams
6 oz or 250 ml. (cm cubed) as to grams, if you are measuring water, its 250 grams. As to other ingredients, such as flour, yeast, sugar, etc. it depends. Check the weight to ml. ratio and apply it.
250 grams of sugar
For most practical and cooking purposes 250 grams is equal to 250 ml.
There is 1 gram of sugar in 1 ml.
250 mL=250 grams
Cream cheese has similar density to water. 250 grams is about 250 ml.
1 cup = 250 ml
250 gm is a standard cup.
In 8 fl Oz or 240 ML there are 28 grams of sugar