To really understand how strong stomach acid is, you’ll first need to understand how a liquid’s acid level is measured. Acidity is measured on a pH scale, which ranges from 0 to 14.

University of Queensland. "Saturated fatty acid levels increase when making memories." ScienceDaily. ScienceDaily, 28 June 2021. <www.sciencedaily.com / releases / 2021 / 06 / 210628123017.htm>.

Acidic foods are those that typically have a pH level of 4.6 or lower. High acidic foods are less likely to develop a quick microorganism growth, which means they might take longer to decompose.