We take about 20,000 breaths daily. Each breath is roughly 0.5 litres. Multiplying these gives an estimate of 10,000 litres of air breathed in one day, which is a reasonable, approximate and useful figure.
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An adult requires 2,000-2,500 kcal daily. By estimating the calories provided by 100g of rice, you can determine the family’s monthly requirement. This helps ensure your estimate remains logical and avoids extremes like starvation.
In science, a theory is not a guess. It is a robust explanation built upon rigorous testing and critical examination. These theories evolve as new evidence emerges, ensuring they remain reliable and accurate.