Obviously the change is in format only I assume. So how does weighing fluid differ from weighing solids?
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A kitchen digital scale can’t accurately switch between fluid ounces and weight ounces without knowing the density of the liquid. I don’t know of any with that function.
Thankfully, most watery liquids have 1 liquid ounce equal to one weight ounce. So if you use the scale for watery liquids, it doesn’t matter so much. But oil and many syrups have meaningful differences from the density of water. You can substantially screw up a recipe assuming 8 liquid ounces of corn syrup (ie 1 cup volume) is 8 weight ounces.
Happily (and oddly), butter has the same density as water, both solid and melted.
There are online guides showing the conversion between 1 cup of a product and the ounces required. Google “1 cup oil ounces”.
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