Basic proportions for boiling long grain white rice are

Question

BlackTom AI · Accepted Answer

Long-grain white rice cooked by boiling (rather than a tight absorption method) commonly requires substantially more water than rice by weight so the grains can move, rehydrate fully, and be drained if needed. A practical commercial/catering guideline is roughly a 3:1 water-to-rice ratio by weight for boiling.

1. Relevant knowledge points and concepts
- Two common methods: absorption (less water, cooked until water is absorbed) and boiling/draining (more water, similar to cooking pasta). Boiling uses more water.
- Water density ~1 g/mL, so 1.5 litres = 1500 g water.
- Ratio can be expressed by weight or volume; converting helps compare options.

2. Step-by-step reasoning
- Start with the candidate option c: 1.5 litres water for 500 g rice.
- Convert units and compute the ratio.

3. Calculations (all intermediate steps)
- 1.5 litres = 1500 mL = 1500 g water (density 1 g/mL).
- Water:rice by weight = 1500 g : 500 g = 3 : 1.
- Convert to cups for intuition (1 cup ≈ 240 mL, 1 cup uncooked long-grain rice ≈ 185–200 g):
  - 1500 mL water ÷ 240 mL/cup ≈ 6.25 cups water.
  - 500 g rice ÷ 200 g/cup ≈ 2.5 cups rice.
  - Thus ≈ 6.25 ÷ 2.5 = 2.5 cups water per cup rice (consistent with a boiling/drain method needing ~2–2.5+ cups water per cup rice).

4. Why the correct answer is correct
- The 3:1 weight ratio (1.5 L to 0.5 kg) provides ample water for boiling long-grain white rice so grains rehydrate and separate; practical catering recipes use similar proportions for boiling and draining.

5. Why the other options are incorrect
- a. 1 L water to 500 g rice → 1000:500 = 2:1 by weight; this is closer to an absorption recipe and may be marginal for a boiling method.
- b. 2 L water to 500 g rice → 2000:500 = 4:1 by weight; excessive water (wasteful) though it would cook rice, it’s not the “basic” recommended proportion.
- d. 500 g water to 500 g rice → 1:1 by weight; far too little water (rice would not rehydrate properly).

6. Conclusion
The best choice is c. 1.5 litres of water to 500 g rice, which matches the provided correct answer.

Basic proportions for boiling long grain white rice areSingle choice

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