High gravity wort refers to a brewing wort that has a higher sugar concentration compared to standard wort. The original gravity of a brew indicates the amount of dissolved sugars present before fermentation, which affects the alcohol content of the final product. High gravity worts are typically used to produce stronger beers.
The Plato scale is commonly used in brewing to measure the concentration of extract (sugars) in a liquid. A range of 13-18° Plato is considered high gravity, as it is significantly higher than the standard gravity used in regular brewing. This means that the wort has a higher concentration of sugars, which will result in a stronger beer once fermented.
- Option (2) 18-20° Plato is too high for the definition of high gravity wort, as it's generally used for stronger styles of beer.
- Option (3) 20-25° Plato is considered a very high gravity range, not typically used for standard brewing practices.
- Option (4) 25-30° Plato is far beyond the typical range for high gravity worts, and is used only for brewing very high-alcohol beers.
Thus, the correct answer is option (1): 13-18° Plato.