‘百吨’ (bǎi dūn) is a compound noun meaning ‘hundred tons’, formed by combining the numeral ‘百’ (bǎi, ‘hundred’) and the unit of mass ‘吨’ (dūn, ‘ton’, equivalent to 1,000 kilograms). Unlike English, Chinese does not use plural forms or articles with measure words like this — ‘百吨’ stands alone as a quantified noun phrase and functions as a single unit in sentences.

This term appears primarily in technical, industrial, or logistical contexts — such as describing cargo weight, mining output, or environmental metrics (e.g., carbon emissions). It’s rarely used in casual speech; instead, people often say ‘一百多吨’ (more than one hundred tons) or approximate with ‘上百吨’ (‘over one hundred tons’) for emphasis or vagueness. Note that ‘吨’ is the standard metric ton in mainland China and differs from the imperial ton used in some English-speaking countries.