@Setanta,
Setanta wrote:
No, that's not what it means at all. Which weighs more, 115 mililiters of water, or 115 mililiters of sand? The common expression in English is that you're comparing apples to oranges. In this case, you comparing measures of weight to measures of volume.
I'm right, Set and EhBeth.
My comparison is a short-cut to clear the barrier for understanding, like adding an auxiliary line to a puzzling geometric figure to make it easy to solve.
Remember: We are talking about portions of fruit and veg, not anything else, so your comparison with sand is an ungrounded aberration. And EhBeth has ignored the fact that common fruit and vegs share almost same specific gravity! You can make an apple into a cup of juice, and get an impression: their weight is about equal to their volumn.
ehBeth wrote:
It appears you didn't understand Setanta's explanation at all.
Different items of the same volume are not necessarily the same weight, so the reference to weight is nonsensical when volume is the measurement.