Tag: Units of measure

According to CustomWater.com, a standard 16.9-ounce water bottle is equivalent to 0.5 liters, a fact that can cause confusion for anyone trying to measure their daily water intake. Understanding the relationship between bottle count and volume is essential for accurate hydration, but is four water bottles truly a liter?

Before vitamin D could be reliably measured chemically around 1980, its potency was determined through a biological assay to prevent rickets. This historical context explains why vitamin D is measured in IU (International Units) and not mg (milligrams), a standard of measurement based on a substance's biological effect rather than its mass.