Question 1

How many milligrams of sodium are in 1 gram of salt?

Accepted Answer

About 393 mg of sodium per 1 g of salt (NaCl). Conversion: salt (g) = sodium (mg) × 2.54 ÷ 1000.

Question 2

How do I convert Celsius to Fahrenheit?

Accepted Answer

°F = °C × 9 / 5 + 32. Example: 200 °C = 392 °F.

Question 3

How do I estimate electricity cost from watts and hours?

Accepted Answer

kWh = watts × hours ÷ 1000. Cost = kWh × unit price. Example: 1500 W × 1 h = 1.5 kWh; at 31 JPY/kWh that is about 47 JPY.

Question 4

How do I calculate calories burned using METs?

Accepted Answer

kcal ≈ METs × body weight (kg) × time (h) × 1.05. Example: 5 METs × 60 kg × 1 h × 1.05 ≈ 315 kcal.

Question 5

How much pure alcohol is in a 350 mL beer at 5% ABV?

Accepted Answer

Pure alcohol (g) = volume (mL) × ABV ÷ 100 × 0.8. 350 × 5 ÷ 100 × 0.8 ≈ 14 g, or about 1.4 Japanese standard drinks.

Question 6

How many sugar cubes are in a 500 mL bottle of cola?

Accepted Answer

A regular 500 mL cola contains about 56 g of sugar, which is roughly 14 sugar cubes (4 g per cube).

Question 7

How much caffeine is in a cup of drip coffee?

Accepted Answer

About 90 mg per 150 mL cup of drip coffee. EFSA's general adult guideline is up to 400 mg per day.

Question 8

What is BMI and how is it calculated?

Accepted Answer

BMI (Body Mass Index) = weight (kg) ÷ height (m)². For example, 70 kg ÷ (1.75 m)² ≈ 22.9. General reference only; not medical advice.

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Physics