Residuumi

Residuumi is a term that denotes a residue or remainder and is used in several languages as the plural or inflected form of residuum. The word originates from Latin residuum, meaning that which remains after a part is removed or after a process.

In science and industry, residuumi designate material left after a process. In chemistry and chemical engineering, the residue is what remains after distillation, evaporation, filtration, or reaction. Examples include petroleum residuum, ash from combustion, or slag. In environmental science, residues refer to contaminants remaining in soil or water after treatment. The exact composition of a residuumi depends on the process and material involved.

In mathematics and related fields, the corresponding terms are residue or residuum. In complex analysis, a residue is the coefficient of (z − z0)^−1 in a Laurent series. In statistics, residuals measure the difference between observed and fitted values. The plural or regional usages may render "residuumi" as a form of these terms in certain languages.

In historical or archaeological writing, residuum can refer to remnants or refuse left from past activities, such as pottery fragments or other material traces.

See also: Residue; Residuum; Remainder.