Ezrelék

Ezrelék is a unit of measurement used to express concentration as one part in a thousand. It is denoted by the symbol ‰ and corresponds to the decimal 0.001 (1/1000). The term is the Hungarian name for the international unit known in English as permille.

Relation to percentage and conversions: 1 ezrelék equals 0.1 percent. To convert, multiply the per mille value by 0.1 or divide by 10. For example, 5 ‰ equals 0.5% and 20 ‰ equals 2%.

Common uses: ezrelék is used in various fields to express dilute concentrations, salinity, or dilution factors. A classic example is seawater salinity, which is about 35 ‰. In some contexts, blood alcohol content may be reported in ‰. It is also used in geology, hydrology, and environmental science to describe isotope ratios or contaminant levels.

Etymology and notation: The term ezrelék reflects Hungarian usage, and the symbol ‰ is recognized internationally as the permille sign. The unit is part of the broader family of measurements that express concentration relative to a thousand, alongside percent (per hundred) and parts per million (ppm).