On Thu 27 Dec 2007 07:43:13p, David Scheidt told us...

> Wayne Boatwright > wrote:
>
>:Only if the recipe was designed for using a scale to measure liquids. I
>:have never seen a recipe that specified a liquid measure in weight.
>:Volumetric ounces do not equal ounces of mass.
>
> Lots of (good) baking recipes do. I much prefer them that way. It's
> much easier to put a container on the scale, hit tare, and add liquid
> until it reads the correct mass than it is to pour it in a measuring cup
> -- it saves having to clean that measure, it's faster (you don't have to
> wait for the liquid to stop moving to read the scale, the way you do with
> a measuring cup), and it saves bending over to read the measure. I
> convert recipes to mass the first time I use one, if I think I'll try
> it a second time, and it makes sense to do so.

Understood, and I agree that weight measurement on an accurate scale is
more desirable. However, apart from baking books I think it is rare to see
liquid ingredient measurements listed this way in ordinary cookbooks. This
is true at least in the US. Most recips, apart from baking, are not that
critical about the measurement, apart from cooking in large quantities.

>:Using a measuring cup, the volume of all liquids will be precisely the
>:same, ounce for ounce.
>
> As long as you use the same measuring cup. They're remarkably
> inaccurate. And lots of things you measure in them are hard to
> measure accurately, because they've got an opaque meniscus.

I can't deny that, but that degree of accuracy is seldom needed in the
average recipe and in home related quantities.

>:Using a scale, I do not understand how the logic of the scale
>:differentiates between an ounce of water and an ounce of molasses. The
>:weight of equal volumes would definitely be different.
>
> There are scales that allow you to set the density of the fluid you're
> measuring, and they'll display the weighed quantity in fl. oz. or
> mililitres. (Lots of industrial packing is done by mass, even if the
> quantity is listed as a fluid measure, or a count.) There are probably
> some that have common kitchen fluids built in, but I've never looked.

I didn't know this, and this is what I was trying to find out. I would
think that this is more common and more useful in commercial applications.
That is, until cookbooks written for the home consumer begin using such
measuring techniques. Otherwise, it would require conversion of virtually
every recipe.

--
Wayne Boatwright

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Date: Thursday, 12(XII)/27(XXVII)/07(MMVII)
Countdown till New Years
4dys 40mins
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The world is a cynic's playground.
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