Originally Posted by CdCf
Assuming watercress doesn't have gas bubbles in it, the density should be very close to that of water (probably off by only a few per cent). Same thing with milk...
In fact, most things we eat should end up fairly close to the density of water, as long as it's not hard candy, protein powder or fat chocolate.
don't think watercress comes in solid chunks... it's chopped up leaves which does have lots of air between leaves, not to mention that the leaves themselves do have lots of air filled spaces (remember your HS biology classes)
1 cup is 34 grams (see below) meaning that 300grams is almost 9 Cups of watercress... unless you are a cow that's alot of watercress if you are planning on eating anthing else that day... with all that fiber you'll probably be really 'regular' though
http://www.nutritiondata.com/facts-B00001-01c20hq.html