🍷 What is ppm (‰) and how to understand it?
We often hear this term in the news about road accidents or medical reports. It's usually associated with alcohol, but it's actually a universal mathematical unit. Let's figure out what's hidden behind this symbol.
Simple mathematics: Percentage vs Permille
To understand the essence, let’s compare ppm with the usual percentage:
Remember the formula:
- Percentage (%) is one hundredth part (1/100).
- Promille (‰) is one thousandth part (1/1000).
- Hence: 1% = 10‰.
Why is this necessary? Permille is used where percentages are too rough. For example, saying “salinity of water 35‰” is more convenient than “3.5%”. The same is with alcohol: the concentration of alcohol in the blood is low, and writing “0.15%” is inconvenient - it’s easier to write “1.5‰”.
🍺 Permille and alcohol: what does this mean in practice?
When talking about the level of blood alcohol, the definition is:
1 ppm (1‰) means that 1 liter of your body fluid contains 1 milliliter of pure ethyl alcohol.
Table of degrees of intoxication
How does ppm influence behavior? We have compiled a visual table:
| Level (‰) | State and risks |
|---|---|
| up to 0.3 | Normal. A person is in complete control of himself. |
| 0.3 – 0.5 | Slight euphoria and relaxation. Attention becomes a little dull. |
| 0.5 – 1.5 | Mild intoxication. Coordination worsens, perception of speed and distance is distorted. You can't drive! |
| 1.5 – 2.5 | Severe intoxication. Memory loss, nausea, loss of balance. |
| 3.0 and higher | Critical conditionRisk of coma and death. |
What affects the speed of intoxication?
Why does one glass of wine affect everyone differently? It all depends on physiology:
- Weight body: The greater the weight, the more fluid in the body, which means the alcohol concentration will be lower.
- Gender: Women usually have the percentage of body fat higher and less water, so the alcohol concentration increases faster than in men of the same weight.
- Snack: Fatty foods slow down the absorption of alcohol into the blood, smoothing out the “peak” of intoxication.
Frequently asked questions (FAQ)
❓ How many ppm are allowed while driving?
In Russia, the permissible limit is 0.16 mg/l in exhaled air or about 0.3 - 0.35 ppm in the blood. This was done to take into account instrumentation errors and natural endogenous alcohol.
❓ How to convert percentages to ppm?
Very simple: multiply number percent by 10. For example, 0.5% = 5‰.
❓ What is the difference between a blood test and a breathalyzer?
The breathalyzer analyzes the vapors in the exhalation and converts them into concentration. A blood test is done in a laboratory and shows the exact ethanol content in the plasma. Blood is the most accurate method used in court.