Oxygen (in the liquid, gas and plasma states) is measured in litres because litres measure fluids, which flow freely. Oxygen (at 68ºF) is a fluid.
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Oxygen is typically measured in liters because it is a gas that is commonly administered in medical settings using oxygen therapy equipment that delivers a specific volume of oxygen per unit of time. Measuring it in liters helps ensure that patients receive the correct amount of oxygen to support their respiratory needs.
Sound pressure levels are typically measured in decibels (dB).
Potassium is typically measured in millimoles per liter (mmol/L) in the blood or urine. Potassium levels are important for proper muscle and nerve function, and abnormal levels can lead to health issues.
The volume of cocoa in a cup is best measured in millilitres.
Nanogram per liter (ng/L) and milligram per liter (mg/L) are both units of measurement used to express the concentration of a substance in a liquid. The main difference is in their scale: nanogram per liter is a smaller unit of measurement than milligram per liter. 1 milligram (mg) is equal to 1,000,000 nanograms (ng), so if a substance is measured in ng/L, it would be a much smaller concentration compared to if it were measured in mg/L.
The mass of a large cup of hot chocolate will vary depending on the specific recipe and ingredients used to make it. However, in general, the mass would be measured in grams or kilograms. The capacity of the cup would be measured in milliliters or liters.