Summary: In HMRC's Alcohol Duty glossary, specific gravity is the ratio of a liquid's weight to the weight of an equal volume of distilled water.
Reference: Alcoholic products technical guide (opens in a new tab)
HM Revenue and Customs · Reference checked 21 July 2026
Where to look: Section 30, Gravity
The summary above is a concise paraphrase of the cited material. It is not a quotation or a complete statement of law.
Related terms
Glossary last reviewed .