This figure can be refined a bit using the USDA database. http://www.nal.usda.gov/fnic/foodcomp/search/ They give density in mixed units (grams per cup) plus nutritional information. They give a figure of 149 g/cup for cherry tomatoes. This works out to 346 g per dry pint. It is probably as authoritative an average as can be found (your tomatoes may vary).
--- On Thu, 11/19/09, John M. Steele <[email protected]> wrote: From: John M. Steele <[email protected]> Subject: Re: [USMA:46184] Re: Trader Joe's tomatoes To: "U.S. Metric Association" <[email protected]>, [email protected] Date: Thursday, November 19, 2009, 6:54 AM If the goal is to make a point, you have insufficient info. If the goal is a servicable estimate, I think it is possible to proceed. The intrinsic density (no air space) has to be close to 1 g/cm³ as it is mostly water. (You can test whether slightly more or less than one by throwing in a glass of water) It is a spheroid, not a true sphere. However, close packed spheres occupy 74% of the volume, random packed spheres around 64%. The bulk density (includes air space) of many practical powders and particulates fall in the range of 60 - 67% of intrinsic density. Taking 64%, a dry pint of tomatoes is about 350 g. Compare on that basis, and any error in which to buy will be too small to matter. --- On Thu, 11/19/09, Pierre Abbat <[email protected]> wrote: From: Pierre Abbat <[email protected]> Subject: [USMA:46184] Re: Trader Joe's tomatoes To: "U.S. Metric Association" <[email protected]> Date: Thursday, November 19, 2009, 12:18 AM On Saturday 07 November 2009 20:21:30 Michael Payne wrote: > I think if they are prepacked, and not weighed at point of sale, they have > to list both customary and metric units. True, but I still don't know how to compare 551 ml of tomatoes, including interstices, with 454 g of tomatoes. I went back there and there's still no indication of the weight of the dry pint of tomatoes. Pierre -- lo ponse be lo mruli po'o cu ga'ezga roda lo ka dinko
