Lifestyle: cooking: dry vs cooked volume (and mass) of rice
Learning to cook means constant self-tutoring. The tutor shares his discovery about rice.
Apparently, white rice triples in volume and mass from dry to cooked. The cooking ratio of water to rice is 2:1, commonly.
During cooking, we assume the cup of rice absorbs the two cups of water. Volumes are seldom additive, but in this case it just works out that the cup of uncooked rice will absorb two cups of water and expand to three cups.
For the rice, by cooking, to triple in mass as well as volume, a cup of raw rice should approximate, in mass, a cup of water. Perhaps it does: a cup of raw rice is about 225g, while a cup of water is 250g. Considering water loss to steam during the cooking process, it’s easy to imagine that the rice absorbs around 90% of the water, or 225g of every cup. Therefore, 3 cups of cooked rice equals 225g of raw rice plus 2x225g of water, which equals 3x225g, exactly three times the dry weight of the rice.
The tripling of volume (for white rice) I take on faith:)
Source:
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.