One liter of vinegar is 2. 1 kg. The density of vinegar is 1.05g cubic centimeter, 1 liter is equal to 1000 cubic centimeter, and the mass is equal to the density multiplied by the volume, so the mass of vinegar is equal to 1 .05 multiplied by 1000 is equal to/kloc-. 1 kg equals 2 kg, then 1.05 kg equals 2. 1 kg, so 1 liter of vinegar equals 2. 1 kg of vinegar. Vinegar is a traditional condiment in major cuisines in China. According to the literature, the history of vinegar brewing is more than 3,000 years, which can be divided into two categories: black vinegar fermented by solid state, red vinegar fermented by liquid state and white vinegar. Vinegar is mainly fermented from glutinous rice, wheat, sorghum, etc. It contains amino acids, lactic acid, organic acids and other components. The famous vinegars in China include Zhenjiang balsamic vinegar, Shanxi aged vinegar, Sichuan Baoning vinegar and Tianjin Duliu aged vinegar.