Opened 11 years ago

Closed 9 years ago

# Metric household measures

For food labeling 21 CFR Part 101.9 (b) (5) (viii) requires metrically aligned customary units:

"For nutrition labeling purposes, a teaspoon means 5 milliliters (mL), a tablespoon means 15 mL, a cup means 240 mL, 1 fl oz means 30 mL, and 1 oz in weight means 28 g."

UCUM has:

 tablespoon [tbs_us] 1 [foz_us]/2 teaspoon [tsp_us] 1 [tbs_us]/3 cup [cup_us] 16 [tbs_us]

and then traces fluid ounce and ounce through the factors/division by 2, 12, or 16 used in the customary unit system. So you end up with odd numbers:

• 1 [foz_us] = 29.5735 mL
• 1 [cup_us] = 236.5882 mL
• 1 [tsp_us] = 4.9289 mL
• 1 [tbs_us] = 14.7868 mL
• 1 [oz_av] = 28.3495 g avoirdupois ounce
• 1 [oz_ap] = 31.1035 g apothecaries ounce

we could potentially add metric spoons and ounces:

• 1 [foz_m] = 30 mL
• 1 [cup_m] = 240 mL
• 1 [tsp_m] = 5 mL
• 1 [tbs_m] = 15 mL
• 1 [oz_m] = 28 g

may be that is what we should do.

### comment:1 Changed 10 years ago by Gunther Schadow

Milestone: → Revision 1.9 set to Gunther Schadow new → assigned

Then let's do it.

### comment:2 Changed 9 years ago by Gunther Schadow

Description: modified (diff) → fixed assigned → closed

done

Note: See TracTickets for help on using tickets.