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Mg/L (milligrams per liter) and mmol/L (millimoles per liter) are units used to measure ethanol concentration in blood or other fluids. The conversion between these units is essential for standardizing alcohol measurements across different laboratory systems and clinical guidelines.
The calculator uses the conversion formula:
Where:
Explanation: This conversion is based on the molecular weight of ethanol (C₂H₅OH), which is 46.07 g/mol. Dividing mg/L by this value converts mass concentration to molar concentration.
Details: Standardized alcohol measurements are crucial for clinical assessment, forensic analysis, and research studies. Different countries and medical systems may use different units, making conversion essential for accurate interpretation and comparison of results.
Tips: Enter the ethanol concentration in mg/L. The value must be greater than 0. The calculator will automatically compute the equivalent value in mmol/L.
Q1: Why is 46.07 used for the conversion?
A: 46.07 g/mol is the molecular weight of ethanol (C₂H₅OH), which is necessary to convert between mass concentration (mg/L) and molar concentration (mmol/L).
Q2: What are typical alcohol concentration ranges?
A: Legal driving limits vary by country but are typically 0.2-0.8 g/L (approx. 4.3-17.4 mmol/L). Clinical intoxication is usually considered at levels above 21.7 mmol/L (1.0 g/L).
Q3: Can this calculator be used for other substances?
A: No, this calculator is specific to ethanol. Other substances have different molecular weights and require different conversion factors.
Q4: How accurate is this conversion?
A: The conversion is mathematically exact based on the molecular weight of ethanol. However, laboratory measurements may have their own analytical variations.
Q5: Why are both units used in different contexts?
A: mg/L is more common in some countries and forensic contexts, while mmol/L is standard in clinical chemistry and many international guidelines.